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

Moscow has denied it is planning an assault, but it has massed an estimated 100,000 troops near Ukraine in recent weeks and is holding military drills at multiple locations in Russia. That has led the United States and its NATO allies to rush to prepare for a possible war.

Several rounds of high stakes diplomacy have failed to yield any breakthroughs, and tensions escalated further this week. NATO said it was bolstering its deterrence in the Baltic Sea region, and the U.S. ordered 8,500 troops on higher alert for potential deployment to Europe as part of an alliance “response force” if necessary. British Prime Minister Boris Johnson also said he is prepared to send troops to protect NATO allies in Europe.

In a show of European unity in Berlin, German Chancellor Olaf Scholz and French President Emmanuel Macron called for an easing of the crisis.

“We … expect clear steps from Russia that will contribute to a de-escalation of the situation,” Scholz said.

Macron, who said he would talk with President Vladimir Putin by phone Friday, added: “If there is aggression, there will be retaliation and the cost will be very high.”

The U.S. and its allies have vowed to hit Russia with sanctions like never before if Moscow sends its military into Ukraine but they have provided few details, saying it’s best to keep Putin guessing.

The U.S. 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, and families of Canadian diplomatic staff also have been told to leave.

In Ukraine, however, authorities have sought to project calm in order not to destabilize the situation and avoid panic — and many citizens have expressed skepticism that there will be an invasion soon.

In parliament, 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,” he said. “No need to have your bags packed.”

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

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

Russia has said Western accusations 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 Ukraine, a former Soviet state that has been locked in a conflict with Russia for almost eight years.

Moscow has rejected Western demands to pull its troops back from areas near Ukraine, saying it will deploy and train them wherever necessary on its territory as a necessary response to what it called “hostile” moves by the U.S. and its allies. Thousands of troops from Russia’s Southern and Western Military Districts took part Tuesday in readiness drills in those regions. The maneuvers involved Iskander missiles and dozens of warplanes.

In 2014, following the ouster of a Kremlin-friendly president in Kyiv, 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 killed over 14,000 people, and efforts to reach a peaceful settlement have stalled.

In the latest standoff, Russia wants guarantees from the West that NATO will never admit Ukraine as a member and that the alliance would curtail other actions, such as stationing troops in former Soviet bloc countries. Some of these, like the membership pledge, are nonstarters for NATO, creating a seemingly intractable stalemate that many fear can only end in a war.

Moscow has accused Ukraine of massing troops near rebel-controlled regions in the east, aiming to retake them by force — accusations Kyiv has rejected.

Analysts say Ukraine’s leaders are caught between trying to calm the nation and ensuring it gets sufficient assistance from the West in case of an invasion.

“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.

The crisis didn’t stop a large group of people from rallying in front of the parliament in Kyiv, demanding changes to the country’s tax regulations and even clashing with police at one point.

Other Ukrainians watched 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,” said Dmytro Ugol, a 46-year-old construction worker in Kyiv. “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 Putin will back away from what U.S. President Joe Biden himself has said looks like a threat to invade Ukraine.

As part of a new $200 million in security assistance directed to Ukraine from the United States, a shipment including equipment and munitions arrived Tuesday in Ukraine, according to Deputy Defense Minister Hanna Maliar.

The U.S. moves are being done in tandem with actions by other NATO members to bolster a defensive presence in Eastern Europe. Denmark 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.

Biden’s national security team has been working with several European nations, the European Commission, and global suppliers on contingency plans if Russia cuts off energy, according to two senior administration officials who briefed reporters about efforts to mitigate spillover effects from potential military action. The officials spoke on the condition of anonymity to discuss the deliberations.

If needed, Europe would look to natural gas supplies in North Africa, the Middle East, Asia and the United States. The effort would require “rather smaller volumes from a multitude of sources” to make up for a Russian cutoff, according to one official.