WASHINGTON — The Biden administration and its allies are assembling a punishing set of financial, technology and military sanctions against Russia that they say would go into effect within hours of an invasion of Ukraine, hoping to make clear to President Vladimir V. Putin the high cost he would pay if he sends troops across the border.

In interviews, officials described details of those plans for the first time, just ahead of a series of diplomatic negotiations to defuse the crisis with Moscow, one of the most perilous moments in Europe since the end of the Cold War. The talks begin on Monday in Geneva and then move across Europe.

The plans the United States has discussed with allies in recent days include cutting off Russia’s largest financial institutions from global transactions, imposing an embargo on American-made or American-designed technology needed for defense-related and consumer industries, and arming insurgents in Ukraine who would conduct what would amount to a guerrilla war against a Russian military occupation, if it comes to that.

Such moves are rarely telegraphed in advance. But with the negotiations looming — and the fate of Europe’s post-Cold War borders and NATO’s military presence on the continent at stake — President Biden’s advisers say they are trying to signal to Mr. Putin exactly what he would face, at home and abroad, in hopes of influencing his decisions in coming weeks.

The talks on Monday will be led by the deputy secretary of state, Wendy Sherman, an experienced diplomat who negotiated the 2015 nuclear agreement with Iran. Russian officials are expected to press their demands for “security guarantees,” including prohibiting the deployment of any missiles in Europe that could strike Russia and the placement of weaponry or troops in former Soviet states that joined NATO after the fall of the Berlin Wall.

Mr. Putin is also demanding an end to NATO expansion, including a promise that Ukraine could never join the nuclear alliance. While the Biden administration has said it is willing to discuss all Russian security concerns — and has a long list of its own — the demands amount to a dismantling of the security architecture of Europe built after the Soviet Union’s collapse.

On Wednesday, members of the NATO alliance will meet with Russia in Brussels. The next day in Vienna, Ukrainian officials will also be at the table, for the first time, for talks at the Organization for Security and Cooperation in Europe. But with 57 members, that group is so large that few expect serious negotiations.

American diplomats worry that after the whirlwind week, the Russians could declare that their security concerns are not being met — and use the failure of talks as a justification for military action. “No one should be surprised if Russia instigates a provocation or incident,” Secretary of State Antony J. Blinken said on Friday, and “then tries to use it to justify military intervention, hoping that by the time the world realizes the ruse, it’ll be too late.”

This time, he said, “we’ve been clear with Russia about what it will face if it continues on this path, including economic measures that we haven’t used before — massive consequences.”

That warning, however, is an unspoken acknowledgment that the Obama administration’s response in 2014, when Mr. Putin last invaded parts of Ukraine, was too tentative and mild. At that time, Mr. Putin surprised the world by annexing Crimea and fueling a grinding proxy war in eastern Ukraine. Now, American officials say they are trying to learn from their past mistakes.

An internal review of those actions, conducted by the White House in recent weeks, concluded that while Obama-era sanctions damaged Russia’s economy and led to a sell-off of its currency, they failed at their central strategic objective: to cause so much pain that Mr. Putin would be forced to withdraw. Nearly eight years later, Russia still holds Crimea and has ignored most of the diplomatic commitments it made in the negotiations that followed, known as the Minsk accords.

Those sanctions started with actions against some smaller Russian banks and individuals directly involved in the invasion. Virtually all of the sanctions — and additional measures imposed after Russia’s interference in the 2016 election and after the SolarWinds cyberattack in 2020 that sabotaged computer programs used by the federal government and American companies — remain in place. But there is scant evidence that they have deterred Mr. Putin, who began building up forces near the Ukrainian border just as Mr. Biden announced his response to SolarWinds last spring.

When asked recently whether he could point to any evidence that the Russians were deterred by recent sanctions, a senior aide to Mr. Biden paused a moment and then said, “No, none.”

Rather than start with moves against small banks and on-the-ground military commanders, officials said, the new sanctions would be directed at cutting off the largest Russian financial institutions that depend on global financial transfers. The plan was described by one official as a “high-impact, quick-action response that we did not pursue in 2014.”

The officials declined to say whether the United States was prepared to cut Russia off from the SWIFT system, which executes global financial transactions between more than 1,100 banks in 200 countries. But European officials say they have discussed that possibility — something most major European powers had declined to consider until recently, for fear that Russia might retaliate by attempting to cut off gas and oil flows in the winter, even briefly.

The SWIFT cutoff has been used against Iran with some success. But Cynthia Roberts, a professor of political science at Hunter College, noted that Russia had learned a lot about “global sanctions-proofing,” and she expressed doubt that the country would suffer as much as American officials contend if it were disconnected from SWIFT.

“They would definitely take a big hit,” she said at a seminar held this past week by the Center for the National Interest. But she noted that Russia had stockpiled hundreds of billions in gold and dollar reserves and that the Bank of China had joined Russia’s own domestic version of SWIFT. That raises the possibility that Russia and China, as part of their expanding partnership, might join forces to help Moscow evade the West’s action.

The bottom line, she said, is that “sanctions have a very poor coercive track record.”

The technology sanctions would target some of Mr. Putin’s favored industries — particularly aerospace and arms, which are major producers of revenue for the Russian government. The focus would be on Russian-built fighter aircraft, antiaircraft systems, antisatellite systems, space systems and emerging technologies where Russia is hoping to make gains, like artificial intelligence and quantum computing.

Similar export controls have been surprisingly effective against China’s leading producer of cellphones, Huawei, which for a while was among the top providers of smartphones to the world. That part of its business has all but collapsed in the past year because it cannot obtain advanced chips. But the Russian economy bears little resemblance to China’s, and it remains unclear whether it is as vulnerable to technology embargoes.

The options under consideration go well beyond merely banning the sale of computer chips. In one additional step, according to American officials, the Commerce Department could issue a ruling that would essentially ban the export of any consumer goods to Russia — from cellphones and laptop computers to refrigerators and washing machines — that contain American-made or American-designed electronics. That would apply not only to American makers, but also to European, South Korean and other foreign manufacturers that use American chips or software.

Unlike China, Russia does not make many of these products — and the effects on consumers could be broad.

But a senior European official said there was still a debate about whether the Russian people would blame Mr. Putin, or the United States and its allies, for their inability to buy the goods.

While the Commerce and Treasury Departments work on sanctions that would maximize America’s advantages over Russia, the Pentagon is developing plans that have echoes of the proxy wars of the 1960s and ’70s.

To underscore the potential pain for Russia, the chairman of the Joint Chiefs of Staff, Gen. Mark A. Milley, spoke with his Russian counterpart two weeks ago and delivered a stark message: Yes, he said, you could invade Ukraine and probably roll over the Ukrainian military, which stands little chance of repelling a far larger, better armed Russian force.

But the swift victory would be followed, General Milley told Gen. Valery Gerasimov, by a bloody insurgency, similar to the one that led to the Soviet retreat from Afghanistan more than three decades ago, according to officials familiar with the discussion.

General Milley did not detail to General Gerasimov the planning underway in Washington to support an insurgency, a so-called “porcupine strategy” to make invading Ukraine hard for the Russians to swallow. That includes the advance positioning of arms for Ukrainian insurgents, probably including Stinger antiaircraft missiles, that could be used against Russian forces.

More than a month ago, Mr. Biden’s national security adviser, Jake Sullivan, created a new interagency planning cell to examine a range of contingencies if Mr. Putin goes ahead with an invasion. The cell, which reports directly to Mr. Sullivan, includes representatives from the National Security Council, the intelligence agencies and the Departments of Defense, State, Treasury, Energy and Homeland Security.

The cell is attempting to tailor responses to the many types of attacks that could unfold in the next few weeks, from cyberattacks aimed at crippling Ukraine’s electric grid and pipelines to the seizure of small or large amounts of territory.

Intelligence officials said recently that they thought the least likely possibility was a full-scale invasion in which the Russians try to take the capital, Kyiv. Many of the assessments, however, have explored more incremental moves by Mr. Putin, which could include seizing a bit more land in the Donbas region, where war has ground into a stalemate, or a land bridge to Crimea.

Several officials familiar with the planning say the administration is looking at European nations that could provide more aid to support Ukrainian forces before any conflict, as well as in the initial stages of a Russian invasion.

Lt. Col. Anton Semelroth, a Defense Department spokesman, noted in December that the United States had already committed over $2.5 billion in security assistance to Ukraine since 2014, including $450 million in 2021 alone. Over the past three months, it has delivered 180 Javelin missiles, two patrol boats, ammunition for grenade launchers, machine guns, secure radios, medical equipment and other items that U.S. officials describe as defensive in nature.

But the planning cell is considering more lethal weaponry, such as antiaircraft weapons.

After visiting Ukraine last month, Representative Seth Moulton, Democrat of Massachusetts and a former Marine officer, said that in his view, “We need to make any incursion by Russia more painful — Day 1 painful, not six months from now painful.”

“We have a short window to take decisive action to deter Putin from a serious invasion,” Mr. Moulton said in an interview. “I worry our current deterrent tactics are responding to an invasion rather than preventing it.”

One option likely to be discussed at NATO this coming week is a plan to increase, possibly by several thousand, the number of troops stationed in the Baltics and in Southeast Europe.

On Friday, Mr. Blinken again warned that if the Russians invade, NATO would deploy more forces along the borders between NATO nations and Russian-controlled territory.