Ukraine’s leaders sought to reassure the nation that a feared invasion from neighboring Russia was not imminent, even as they acknowledged the threat is real and prepared to accept a shipment of American military equipment Tuesday to shore up their defenses.

Russia has denied it is planning an assault, but it has massed an estimated 100,000 troops near Ukraine in recent weeks, leading the United States and its NATO allies to rush to prepare for a possible war.

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Several rounds of high stakes diplomacy have failed to yield any breakthroughs, and this week tensions escalated further. NATO said it was bolstering its deterrence in the Baltic Sea region, and the U.S. ordered 8,500 troops on higher alert to potentially deploy to Europe as part of an alliance “response force” if necessary.

The State Department has ordered the families of all American personnel at the U.S. Embassy in Kyiv to leave the country, and it said that nonessential embassy staff could leave. Britain said it, too, was withdrawing some diplomats and dependents from its embassy.

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In Ukraine, however, authorities have sought to project calm — while recent polls show that just half of the country believes an invasion is possible.

Speaking in the parliament on Tuesday, Defense Minister Oleksii Reznikov said that “as of today, there are no grounds to believe” that Russia is preparing to invade imminently, noting that its troops have not formed what he called a battle group that could force its way through the border.

“Don’t worry, sleep well,” Reznikov said. “No need to have your bags packed.”

Reznikov’s remarks come on the heels of multiple reassurances from Ukrainian President Volodymyr Zelenskyy and other officials. On Monday, Zelenskyy told the nation that the situation was “under control.”

In an interview aired late on Monday, however, the defense minister acknowledged that “there are risky scenarios” that “are possible and probable in the future.”

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Russia has said Western accusations that it is planning an attack are merely a cover for NATO’s own planned provocations. Kremlin spokesman Dmitry Peskov on Tuesday once again accused the U.S. of “fomenting tensions” around the Ukraine, a former Soviet state that Russia has been locked in a bitter tug-of-war with for almost eight years.

In 2014, following the ouster of a Kremlin-friendly president in Ukraine, Moscow annexed Ukraine’s Crimean peninsula and threw its weight behind a separatist insurgency in the country’s industrial heartland in the east. The fighting between Ukrainian forces and Russia-backed rebels has since killed over 14,000 people, and efforts to reach a peaceful settlement of the conflict have stalled.

In the latest standoff, Russia has demanded guarantees from the West that NATO would never allow Ukraine to join and that the alliance would curtail other actions, such as stationing troops in former Soviet bloc countries. Some of these, like any pledge to permanently bar Ukraine, are non-starters for NATO — creating a seemingly intractable stalemate that many fear can only end in war.

Moscow has also accused Ukraine of massing troops near the rebel-controlled regions in the east, with the alleged aim of retaking them by force — accusations Kyiv has rejected.

Analysts say the Ukrainian government is caught between trying to calm the nation and ensuring it gets sufficient assistance from the West in case an invasion does happen.

“Ukrainian authorities are trying to prevent destabilization and panic inside the country, hence the calming statements saying there is no threat of an imminent Russian invasion,” political analyst Volodymyr Fesenko said.

“The Kremlin’s plans include undermining the situation inside Ukraine, fomenting hysteria and fear among Ukrainians, and the authorities in Kyiv find it increasingly difficult to contain this snowball,” he added.

Ordinary Ukrainians are indeed watching warily.

“Of course we fear Russia’s aggression and a war, which will lead to the further impoverishment of Ukrainians. But we will be forced to fight and defend ourselves,” Dmytro Ugol, a 46-year-old construction worker in Kyiv, said. “I am prepared to fight, but my entire family doesn’t want it and lives in tension. Every day, the news scares us more and more.”

Putting U.S.-based troops on heightened alert for Europe on Monday suggested diminishing hope in the West that Russian President Vladimir Putin will back away from what U.S. President Joe Biden himself has said looks like a threat to invade neighboring Ukraine.

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As part of a new $200 million in security assistance directed to Ukraine from the United States, a shipment including equipment and munitions is also expected to arrive Tuesday in Ukraine.

The U.S. moves are being done in tandem with actions by other NATO member governments to bolster a defensive presence in Eastern Europe. Denmark, for example, is sending a frigate and F-16 warplanes to Lithuania; Spain is sending four fighter jets to Bulgaria and three ships to the Black Sea to join NATO naval forces, and France stands ready to send troops to Romania.