Ukrainians defied pressure from Moscow with a national show of flag-waving unity Wednesday, while the West warned that it saw no sign of a promised pullback of Russian troops from Ukraine’s borders despite Kremlin declarations of a withdrawal.

While a feared Russian invasion of Ukraine on Wednesday did not materialize, the United States and its allies maintain that the threat remains strong, with Europe’s security and economic stability in the balance.

Russian President Vladimir Putin has signaled he wants a peaceful path out of the crisis, and U.S. President Joe Biden promised that the U.S. would continue to give diplomacy “every chance,” but he struck a skeptical tone about Moscow’s intentions. Biden also insisted that Washington and its allies would not “sacrifice basic principles” respecting Ukraine sovereignty.

Russia has massed about 150,000 troops east, north and south of Ukraine, according to Western estimates. Moscow denies it has any plans to invade, and this week announced a pullback of some forces and weapons. While details are scarce and the withdrawal is only partial, the Russian statements have lowered the political temperature following weeks of escalating tensions.

Russian Defense Ministry video showed a trainload of armored vehicles moving across a bridge away from Crimea, the Black Sea peninsula that Russia annexed from Ukraine in 2014. It also announced that more tank units of the Western Military District were being loaded on trains to move back to their permanent bases after training exercises.

But at the same time, Russia is continuing war games near Ukraine’s borders and across its vast territory. The U.S. and Europe are maintaining threats of harsh sanctions. Trust between East and West remains elusive.

“We haven’t seen a pullback,” U.S. Secretary of State Antony Blinken told ABC News. “He (Putin) can pull the trigger. He can pull it today. He can pull it tomorrow. He can pull it next week. The forces are there if he wants to renew aggression against Ukraine.”

NATO Secretary-General Jens Stoltenberg said the alliance also had not seen “any withdrawal of Russian forces,” as did multiple European governments. Before chairing a NATO defense ministers meeting in Brussels, he said: “If they really start to withdraw forces, that’s something we will welcome, but that remains to be seen.”

In the meantime, the alliance is examining this week how and when to rapidly dispatch troops and equipment to countries closest to Russia and the Black Sea region should Moscow order an invasion.

Ukrainian President Volodymyr Zelenskyy similarly dismissed the Russian withdrawal claims.

“What is this? Rotations, withdrawal, returning back again,” he said on a visit to the southeastern city of Mariupol. “It’s too early to rejoice.”

The Ukrainian leader has repeatedly sought to project calm as well as strength during the crisis, declaring Wednesday a “Day of National Unity.”

“We are united by a desire to happily live in peace,” Zelenskyy said in an address to the nation earlier in the day. “We can defend our home only if we stay united.”

Across the country, Ukrainians of all ages waved flags in the streets and from apartment windows.

Hundreds unfolded a 200-meter (650-foot) flag at Kyiv’s Olympic Stadium, while another was draped in the center of a shopping mall in the capital.

In the government-controlled part of Ukraine’s eastern region of Luhansk, where Russian-backed separatists have been fighting Ukrainian troops since 2014, residents stretched another huge flag across a street.

“This event, this number of people united around Ukrainian flag will show that we stand for united Ukraine,” said resident Olena Tkachova.

Russia has repeatedly complained the U.S. and NATO have not responded satisfactorily in writing to its security concerns. Foreign Ministry spokeswoman Maria Zakharova said Wednesday that Russia is in the final phase of preparing its formal response to the West. “After that, a schedule of further steps will be developed,” she said on state television.

It appears to be another indication that Russia is playing a long game, determined to keep up the pressure for awhile.

Russia wants the West to keep Ukraine and other former Soviet nations out of NATO, halt weapons deployments near Russian borders and roll back forces from Eastern Europe. The U.S. and its allies have roundly rejected those demands, but they offered to engage in talks with Russia on ways to bolster security in Europe.

Speaking after meeting with German Chancellor Olaf Scholz on Tuesday, Putin dismissed assurances that NATO’s eastward expansion isn’t on the alliance’s agenda as not enough to assuage his concerns.

“They are telling us it won’t happen tomorrow,” Putin said. “Well, when will it happen? The day after tomorrow? We want to solve this issue now as part of a negotiation process through peaceful means.”

For now, Russia is flexing its muscle. Russian fighter jets flew training missions Wednesday over neighboring Belarus and paratroopers held shooting drills at firing ranges there as part of massive war games that the West feared could be used as cover for an invasion of Ukraine. Belarusian Foreign Minister Vladimir Makei reaffirmed that all Russian troops and weapons will leave the country when the maneuvers end Sunday.

Russia has mocked Western warnings about an imminent invasion as “paranoia” and “madness.” Kremlin spokesman Dmitry Peskov pointed sarcastically at warnings of Wednesday’s invasion, saying that Russian officials had a good sleep.

Asked by German daily Welt if Russia was going to attack Wednesday, Russia’s ambassador to the European Union Vladimir Chizhov quipped: “Wars in Europe rarely start on a Wednesday.”

“There won’t be an escalation next week either, on in the week after, or in the coming month,” he said.

But British Defense Secretary Ben Wallace told Sky News that instead of a Russian withdrawal, “we’ve seen continued buildup of things like field hospitals and strategic weapons systems.”

Western powers are not lowering their guard, and are holding a series of meetings in Europe this week dominated by the Ukraine crisis: the NATO defense ministers gathering, a summit of EU leaders starting Thursday, and the Munich Security Conference starting Friday, including appearances by Blinken and U.S. Vice President Kamala Harris.

Ukrainians are once again caught in the middle of a geopolitical standoff.

On Tuesday, a series of cyberattacks knocked out the websites of the Ukrainian army, the defense ministry and major banks, and Serhii Demediuk, the No. 2 official at Ukraine’s National Security and Defense Council, blamed Russia.

“The action continued a hybrid aggression of the Russian Federation,” Demediuk told The Associated Press, adding that his group was was working “to stem the attacks and track down their source.” He provided no details, and the Kremlin denied any involvement.

In Moscow, Russian lawmakers sent an appeal to Putin urging him to recognize rebel-held areas in eastern Ukraine as independent states — where Russia has supported rebels in a conflict that has killed over 14,000 in nearly eight years. Putin signaled that he wasn’t inclined to back the motion, which would effectively shatter a 2015 peace deal that was a diplomatic coup for Moscow.

(AP)