French President Emmanuel Macron is set to hold talks in Moscow Monday in a bid to to help de-escalate the tense situation around Ukraine.

The concentration of an estimated 100,000 Russian troops near Ukraine has fueled Western worries that it heralds a possible offensive, with White House national security adviser Jake Sullivan warning Sunday that Russia could invade Ukraine “any day,” triggering a conflict that would come at an “enormous human cost.”

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Russia has denied any plans to attack its neighbor, but is urging the U.S. and its allies to bar Ukraine and other ex-Soviet nations from joining NATO, halt weapons deployments there and roll back NATO forces from Eastern Europe. Washington and NATO have rejected the demands.

Macron, who is set to meet in the Kremlin with Russian President Vladimir Putin before visiting Ukraine Tuesday, said last week that his priority is “dialogue with Russia and de-escalation.”

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Before heading to Moscow, Macron had a call Sunday with U.S. President Joe Biden. They discussed “ongoing diplomatic and deterrence efforts in response to Russia’s continued military build-up on Ukraine’s borders, and affirmed their support for Ukraine’s sovereignty and territorial integrity,” the White House said in a statement.

The French presidency said Macron sought to ensure “good coordination” with Biden in the call.

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In an interview with French newspaper Journal du Dimanche published on Sunday, Macron said that “we won’t get unilateral gestures but it is indispensable to prevent a degradation of the situation before building confidence gestures and mechanisms.”

“The geopolitical objective of Russia today is clearly not Ukraine, but to clarify the rules of cohabitation with NATO and the EU,” Macron said. “The security and sovereignty of Ukraine or any other European state cannot be a subject for compromise, while it is also legitimate for Russia to pose the question of its own security.”

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Continuing the high-level diplomacy, German Chancellor Olaf Scholz is set to meet with Biden Monday for talks expected to focus on the Ukrainian standoff. Scholz is set to travel to Kyiv and Moscow on Feb. 14-15.

In 2015, France and Germany helped broker a peace deal for eastern Ukraine in a bid to end the hostilities between Ukrainian forces and Russia-backed separatists that erupted the previous year following the Russian annexation of Ukraine’s Crimean Peninsula.