Russia-Ukraine updates: US to ban Russian carriers from its airspace

Russian-backed separatists in eastern Ukraine have declared a mass evacuation of civilians, while accusing Ukrainian President Volodymyr Zelenskyy of preparing to launch a full-scale invasion against the breakaway regions in the coming days.

Ukraine has immediately denied the claim, but the mass evacuation order is worrying as it raises the prospect the separatists may allege a Ukrainian offensive in the coming days that Russia would use as a pretext to attack its ex-Soviet neighbor.

Denis Pushilin, leader of the self-proclaimed People's Republic of Donetsk in a breakaway region of southeastern Ukraine known as Donbas, delivered a public address to residents on Friday saying mass, centralized evacuations were now being organized, with women, children and the elderly going first.

Pushilin said the evacuation would be "temporary" and that Russia has agreed to provide evacuation centers in the neighboring Rostov region to house evacuees. The separatists' leader also called on all able-bodied men to take up arms.

"I again appeal to all men able to hold a rifle in their hands, to come to the defense of their land," Pushilin said in a televised address.

The announcement came amid a sharp escalation along the front line between Russia-backed separatist forces and Ukrainian government troops, with Ukraine accusing the separatists of unleashing a major bombardment in the past two days. Heavy firing has been reported since Thursday coming from the separatist areas, while the separatists have accused Ukrainian troops of firing on them.

-ABC News' Patrick Reevell

The United States believes Russia now has "probably" as many as 190,000 troops, including Russian-backed separatists forces, according to a U.S. envoy, in and around Ukraine amid fears that Russian capabilities of a full-fledged invasion continue to grow.

"We assess that Russia probably has massed between 169,000 to 190,000 personnel in and near Ukraine as compared with about 100,000 on January 30," Michael Carpenter, U.S. ambassador to the Organization for Security and Cooperation in Europe (OSCE), said in a statement Friday. "This estimate includes military troops along the border, in Belarus, and in occupied Crimea; Russian National Guard and other internal security units deployed to these areas; and Russian-led forces in eastern Ukraine."

Unlike this latest assessment, previous estimations by U.S. officials did not include separatist forces in eastern Ukraine.

"While Russia has sought to downplay or deceive the world about their ground and air preparations, the Russian military has publicized its large-scale naval exercises in the Black Sea, Baltic Sea and the Arctic," Carpenter said. "Russia has publicly said the Black Sea exercise alone involves more than 30 ships, and we assess that amphibious landing ships from the Northern and Baltic Fleets were sent to the Black Sea to augment forces there."

The OSCE is a Cold War-era European security forum that has deployed a war monitor in eastern Ukraine for years and hosted talks on the current crisis with Russia. Its foundational documents have been used selectively by Moscow to paint Ukraine and NATO as a threat to Russia's security, even as its envoy in Vienna has largely dismissed dialogue there.

Earlier this week, Ukraine requested an emergency OSCE meeting to demand Russia explain its massive military buildup after Moscow ignored Kyiv's inquiry. Russia skipped Wednesday's session just as it did Friday's, where Carpenter delivered these remarks.

Meanwhile, Ukrainian Defense Minister Oleksii Reznikov told his country's parliament Friday that they assess Russia has about 149,000 troops near their borders.

-ABC News Conor Finnegan and Cindy Smith

The United States announced Friday its plans to sell $6 billion of new military aid to Poland, amid the threat of war between neighboring Ukraine and Russia.

The proposed sale includes 250 Abrams main battle tanks, 250 short-range jamming systems that counter improvised explosive devices, 26 combat recovery vehicles, nearly 800 machines guns and much more, according to a press release from the U.S. Department of State.

The announcement came as U.S. Secretary of Defense Lloyd Austin met with his Polish counterpart in Warsaw to discuss concerns regarding the massive buildup of Russian troops near Ukraine, which U.S. and NATO officials say position Moscow for an imminent invasion. Poland is a key eastern European ally to the U.S. and a fellow member of NATO.

"Some of those forces [are] within 200 miles of the Polish border," Austin said during a joint press conference in the Polish capital on Friday. "If Russia further invades Ukraine, Poland could see tens of thousands of displaced Ukrainians and others flowing across its border, trying to save themselves and their families from the scourge of war."

Austin said the U.S. now has an additional 4,700 troops in Poland "who are prepared to respond to a range of contingencies."

"They will work closely with our State Department and with Polish authorities should there be any need to help American citizens leave Ukraine," he added.

The planned sale of more military aid to Poland "will support the foreign policy and national security of the United States by helping to improve the security of a NATO Ally that is a force for political stability and economic progress in Europe," according to the State Department.

"The proposed sale will improve Poland’s capability to meet current and future threats by providing a credible force that is capable of deterring adversaries and participating in NATO operations," the State Department said in a statement Friday. "Poland will have no difficulty absorbing this equipment into its armed forces."

-ABC News' Conor Finnegan

Russia is concerned about the ongoing escalation of tensions in the Donbas region of eastern Ukraine and believes the events unfolding there post a major potential threat, Kremlin spokesman Dmitry Peskov said Friday.

"What is happening in Donbas is very disquieting news, which provokes concern," Peskov told reporters during a daily call. "It is potentially very dangerous."

When asked how Putin has been sleeping amid the rising tensions, Peskov said: "Equally well." He then added after a brief pause: "But with one eye open."

-ABC News' Anastasia Bagaeva