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

Ukraine has requested an urgent meeting of the UN Security Council in response to the appeal made by Russian-controlled separatists for military help from Russia.

“Ukraine has requested an urgent meeting of the UN Security Council due to the appeal by Russian occupation administrations in Donetsk and Luhansk to Russia with a request to provide them with military assistance, which is a further escalation of the security situation,” Ukraine’s foreign minister Dmytro Kuleba tweeted.

-ABC News' Patrick Reevell

State Department spokesman Ned Price told reporters the U.S. is not planning to draw down its embassy in Moscow.

"It will be our goal to be in a position to maintain diplomatic communication, the ability to convey clearly any messages that we need to send to the Russian Federation. Embassies are an important tool in that," he said.

Price had no comment on whether Ukraine should sever diplomatic ties with Russia and said it's their choice.

-ABC News' Conor Finnegan

Russian-controlled separatists have formally appealed to Russian President Vladimir Putin for military assistance "in repulsing Ukrainian aggression", according to the Kremlin's spokesman.

In a letter, the separatist leaders invoked the mutual defense pact Russia signed with them after recognizing them.

Ukrainian officials, meanwhile, have maintained that Russia is the aggressor on the ground.

Asked by ABC News reporter Ike Ejiochi whether the formal request from the separatists to Putin was a signal that the U.S. expects a broader invasion is about to begin, White House press secretary Jen Psaki said it was "an example" of "a range of false flag operations" the U.S. had expected.

"As we've said from the beginning, there are going to be a range of false flag operations that we have expected to and laid out the playbook to see," Psaki said during her on-cam briefing this afternoon. "This is an example of it."

"That is suggesting that they feel under threat by whom? The Ukrainians that the Russians are threatening to attack," she continued. "So we'll continue to call out what we see as false flag operations or efforts to spread disinformation about what the actual status is on the ground."

-ABC News' Patrick Reevell and Ben Gittleson

Pentagon press secretary John Kirby, at an afternoon press briefing on Wednesday, said Russian forces are now prepared for an invasion of Ukraine.

"What we see is that Russian forces continue to assemble closer to the border and put themselves in an advanced stage of readiness to act to conduct military action in Ukraine," Kirby said. "We believe that they are ready."

He said that the U.S. does not know when or how an invasion might begin but repeated President Joe Biden's message that if a large-scale invasion happens, it will be a "war of choice" for Putin.

"There will be suffering, there will be sacrifice, and all of that must and should be laid at his feet because he's doing this by choice," Kirby said. 

"I would hope that he understands that some of those lives at risk will be his soldiers' lives and he's going to have to answer to Russian moms and dads about their soldiers that aren't making it back home alive or making it back with injuries. He's going to have to answer for that," Kirby added later.

Kirby went farther than a senior defense official who spoke to reporters earlier Wednesday, saying the U.S. "certainly" believes Russia is sending additional troops into the separatist-controlled areas of Donbas. 

"We can't confirm with any great specificity, the numbers and what the formations are, what the capabilities are, but we certainly that that's happening," he said.

-ABC News' Matt Seyler