The Kremlin signaled Monday it is ready to keep talking with the West about security grievances that led to the current Ukraine crisis, offering hope that Russia might not invade its beleaguered neighbor within days as the U.S. and European allies increasingly fear.

Questions remain about Russian President Vladimir Putin's intentions, however. And countries are evacuating diplomats and on alert for possible imminent war amid the worst East-West tensions since the Cold War.

On a last-ditch diplomatic trip, Germany's chancellor said there are "no sensible reasons" for the buildup of more than 130,000 Russian troops on Ukraine's borders to the north, south and east, and he urged more dialogue.

Britain's prime minister said Europe is "on the edge of a precipice" - but added, "there is still time for President Putin to step back." France's foreign minister, Jean-Yves Le Drian, told French television that "all elements" were in place for a strong Russian offensive, but "nothing shows today" that Putin has decided to launch one.

Despite warnings from Washington, London and elsewhere that Russian troops could move on Ukraine as soon as Wednesday, Monday's meeting between Putin and Foreign Minister Sergey Lavrov suggested otherwise.

At the session with Putin, Lavrov argued that Moscow should hold more talks with the U.S. and its allies despite their refusal to consider Russia's main security demands.

Moscow, which denies it has any plans to invade Ukraine, wants Western guarantees that NATO won't allow Ukraine and other former Soviet countries to join as members. It also wants the alliance to halt weapons deployments to Ukraine and roll back its forces from Eastern Europe - demands flatly rejected by the West.

The talks "can't go on indefinitely, but I would suggest to continue and expand them at this stage," Lavrov said, noting that Washington has offered to conduct dialogue on limits for missile deployments in Europe, restrictions on military drills and other confidence-building measures. Lavrov said possibilities for talks "are far from being exhausted."

His comments, at an appearance orchestrated for TV cameras, seemed designed to send a message to the world about Putin's own position: namely, that hopes for a diplomatic solution aren't yet dead.

Putin noted the West could try to draw Russia into "endless talks" and questioned whether there is still a chance to reach agreement. Lavrov replied that his ministry wouldn't allow the U.S. and its allies to stonewall Russia's main requests.

The U.S. reacted coolly to Lavrov's comments.

"The path for diplomacy remains available if Russia chooses to engage constructively," White House principal deputy press secretary Karine Jean-Pierre said. "However, we are clear-eyed about the prospects of that, given the steps Russia is taking on the ground in plain sight."

U.S. officials said the Russian military continued apparent attack preparations along Ukraine's borders. A U.S. defense official said small numbers of Russian ground units have been moving out of larger assembly areas for several days, taking up positions closer to the Ukrainian border at what would be departure points if Putin launched an invasion.

The official spoke on condition of anonymity to discuss information not publicly released. CBS News was first to report on the movement of the units.

Satellite images taken over the last 48 hours show increased Russian military activity in Belarus, Crimea and western Russia, including the arrival of helicopters, ground-attack aircraft and fighter-bomber jets at forward locations. The photos also show ground forces leaving their garrisons and combat units moving into convoy formation, according to Maxar Technologies, a commercial satellite imagery company that has been monitoring the Russian buildup.

Ukrainian security and defense council chief Oleksiy Danilov downplayed the threat of invasion but warned of the risk of "internal destabilization" by unspecified forces.

"Today we do not see that a large-scale offensive by the Russian Federation can take place either on (Feb.) 16th or the 17th," he told reporters after meeting lawmakers. "We are aware of the risks that exist in the territory of our country. But the situation is absolutely under control."

As if to show defiance, Ukrainian President Volodymyr Zelenskyy said Wednesday would be a "day of national unity," calling on the country to display the blue-and-yellow flags and sing the national anthem in the face of "hybrid threats."

"Our country today is as strong as ever. It is not the first threat the strong Ukrainian people have faced," Zelenskyy said Monday evening in a video address to the nation. "We're calm. We're strong. We're together. A great nation in a great country."

The country is preparing nonetheless. Kyiv residents received letters from the mayor urging them "to defend your city," and signs appeared in apartment buildings indicating the nearest bomb shelter. The mayor says the capital has about 4,500 such sites, including underground parking garages, subway stations and basements.

Dr. Tamara Ugrich said she stocked up on grains and canned food, and prepared an emergency suitcase.

"I don't believe in war, but on TV the tension is growing every day and it's getting harder and harder to keep calm. The more we are told not to panic, the more nervous people become," she said.

Others heeded the advice of Ukraine's leaders not to panic. Street music flooded central Maidan Square on Sunday night and crowds danced. "I feel calm. You should always be ready for everything, and then you will have nothing to be afraid of," said Alona Buznitskaya, a model.

During what could be a crucial week for Europe's security, German Chancellor Olaf Scholz visited Ukraine on Monday before heading to Moscow for talks with Putin on a high-stakes diplomatic foray.

After meeting Zelenskyy, Scholz urged Russia to show signs of de-escalation, and reiterated unspecified threats to Russia's financial standing if it invades.

"There are no sensible reasons for such a military deployment," Scholz said.

U.N. Secretary-General Antonio Guterres held talks with Lavrov and Ukrainian Foreign Minister Dmytro Kuleba and said in a statement that "abandoning diplomacy for confrontation is not a step over a line, it is a dive over a cliff."

U.S. President Joe Biden on Monday spoke by phone with British Prime Minister Boris Johnson. According to a Downing Street statement, the two "agreed there remained a crucial window for diplomacy and for Russia to step back from its threats towards Ukraine."

The U.S. said it will close its embassy in Kyiv and move all remaining staff there to Lviv, a city near the Polish border. Lithuania moved diplomats' families and some nonessential diplomatic workers out of the country as well.

"It's a big mistake that some embassies moved to western Ukraine," Zelenskyy said. "It's their decision, but 'western Ukraine' doesn't exist. It's united Ukraine. If something happens, God forbids, it (escalation) will be everywhere."

So far, NATO's warnings have had little effect: Russia has only bolstered troops and weapons in the region and launched massive drills in its ally Belarus, which also neighbors Ukraine. The West fears that the drills, which run through Sunday, could be used by Moscow as a cover for an invasion from the north.

One possible off-ramp emerged this week: Ukraine's ambassador to the U.K., Vadym Prystaiko, pointed at a possibility of Ukraine shelving its NATO bid - an objective that is written into its constitution - if it would avert war with Russia.

"We might - especially being threatened like that, blackmailed by that, and pushed to it," Prystaiko told BBC Radio 5.

On Monday, Prystaiko appeared to back away from the idea, but the fact that it was raised at all suggests it is being discussed behind closed doors.

Pressed over Ukraine's NATO ambitions Monday, the Ukrainian president remained vague, referring to them as a "dream."

Kremlin spokesman Dmitry Peskov said Russia would welcome such a move.

From The Associated Press