Smoke rises over a field during the Union Courage-2022 Russia-Belarus military drills in Belarus on Saturday. AP

Ukrainian President Volodymyr Zelenskyy, facing a sharp spike in violence in and around territory held by Russia-backed rebels and increasingly dire warnings that Russia plans to invade, on Saturday called for Russian President Vladimir Putin to meet him and seek resolution to the crisis.

"I don't know what the president of the Russian Federation wants, so I am proposing a meeting,” Zelenskyy said at the Munich Security Conference, where he also met with US Vice President Kamala Harris. Zelenskyy said Russia could pick the location for the talks.

READ MORE

West puts up united front as Russia begins nuclear exercises

Russia adds troops near Ukraine despite drawdown: claims US

"Ukraine will continue to follow only the diplomatic path for the sake of a peaceful settlement.”

There was no immediate response from the Kremlin.

Ukrainian President Volodymyr Zelenskyy gestures for a photograph. File photo

Meanwhile, French President Emmanuel Macron will call Putin on Sunday to try to avert what Western powers predict will be an imminent invasion of Ukraine.

Over the weekend, civilians were evacuated from increasingly barraged front line regions where Kyiv said Saturday two of its soldiers had died in an attack -- the first fatalities in the conflict in more than a month.

The Kremlin insists it has no incursion plans, but its test-firing of nuclear-capable missiles on Saturday did little to alleviate tensions.

"Every indication indicates that Russia is planning a full-fledged attack against Ukraine," NATO chief Jens Stoltenberg said.

NATO chief Jens Stoltenberg speaks during an event. File photo

US President Joe Biden, who earlier said he was "convinced" Russia would invade in the coming days, is convening a rare Sunday National Security Council meeting over the crisis.

US and EU officials have said they believe Moscow is attempting to fabricate a pretext for its offensive by having proxy outlets put out false information about violence in rebel-held enclaves in eastern Ukraine.

"Locals in Donetsk reported calm despite Russian claims of a car bomb," said US State Department spokesman Ned Price.

Zelenskyy spoke hours after separatist leaders in eastern Ukraine ordered a full military mobilization on Saturday while Western leaders made increasingly dire warnings that a Russian invasion of its neighbor appeared imminent.

In new signs of fears that a war could start within days, Germany and Austria told their citizens to leave Ukraine. German air carrier Lufthansa canceled flights to the capital, Kyiv, and to Odessa, a Black Sea port that could be a key target in an invasion.