Russia-Ukraine updates: Putin says 'certain positive movements' in negotiations

Ukrainian President Volodymyr Zelenskyy angrily denounced NATO in a televised address Friday over its refusal to impose a no-fly zone over Ukraine.

"Knowing that new strikes and casualties are inevitable, NATO has consciously taken the decision not to close the sky over Ukraine. All the people who will die from this day, will die also because of you," he said.

Zelenskyy accused NATO of creating a narrative "that the closure of the sky will allegedly provoke a war with Russia."

"It's a self-hypnosis of those who are weak, unconfident inside, though it can possess weapons a lot bigger than we do. You should have thought about people, about humanity," he said.

Zelenskyy said the alliance did agree to purchase 50 tons of fuel, but the president scoffed at the move.

"I don't know who you can defend and whether you are capable. You can't pay off with liters of diesel fuel for the liters of our blood, shed for our common Europe, for our common freedom, for our joint future," he said.

-ABC News' Patrick Reevell and Yulia Drozd

Vice President Kamala Harris has scheduled a trip to Warsaw, Poland, and Bucharest, Romania, next week, according to her office.

Harris will meet with leaders of both countries from March 9 to March 11, deputy press secretary Sabrina Singh said in a statement.

"They will discuss our continuing support for the people of Ukraine through security, economic, and humanitarian assistance and our determination to impose severe economic consequences on Russia and those complicit in Russia’s invasion," she said.

"The vice president’s meetings will also focus on how the United States can further support Ukraine’s neighbors as they welcome and care for refugees fleeing violence," Singh added.

-ABC News' Ben Gittleson

The White House on Friday did not rule out banning Russian oil imports to the U.S., saying it was "looking at ways to reduce the import of Russian oil," but showed continued reluctance in light of the impact it would have on energy prices.

“We are considering a range of options, but what's really essential is that we maintain a steady supply of global energy,” Cecilia Rouse, the chair of the White House's Council of Economic Advisers, said at the White House press briefing.

Adding, “Energy is a global market and we do not want to disrupt that market.”

Bloomberg on Friday reported that “the administration is weighing a ban on U.S. imports of Russian crude oil,” and that “conversations are taking place within the administration and with the U.S. oil and gas industry on the impact such a move would have on American consumers and the global supply,” citing unnamed “people familiar with the matter."

An expert at GasBuddy told ABC News on Thursday that banning Russian oil imports would, in fact, likely raise gas prices in the U.S.

Psaki said there wasn’t any “outside event” for which the U.S. was waiting to implement a ban, but that the White House was “mindful of not taking steps” that would raise energy prices for Americans and that the U.S. also wanted to take steps in concert with allies.

There would be a much larger impact on energy prices in Europe, which is a lot more reliant on Russian oil, according to experts.

-ABC News' Ben Gittleson

Russia's state censor, Roskomnadzor, added Twitter to its list of banned sites in the country on Friday, following a request from the Russian prosecutor general.

Earlier Friday, Roskomnadzor banned Facebook as the Russian government moves to limit dissent over the war in Ukraine.

-ABC News' Patrick Reevell