Representatives from Facebook and Twitter provided updates about their services after the Russian government announced it would block both services.

Twitter security chief Yoel Roth said the company has not confirmed its services are completely disabled in Russia during a public panel Friday evening.

Meta, Facebook's parent company, put out a statement contending, "despite the Russian government’s announcement that they will be blocking Facebook, we are working to keep our services available to the greatest extent possible."

Meta added that "ads targeting people in Russia will be paused, and advertisers within Russia will no longer be able to create or run ads anywhere in the world, including within Russia."

-ABC News' Quinn Owen

As tensions rise between the United States and Russia over the conflict in Ukraine, national security officials will appear on Capitol Hill March 8 at 10 a.m. for the House Intelligence Committee's annual worldwide threats hearing.

The public portion of the hearing will include CIA Director Bill Burns, FBI Director Chris Wray and Director of National Intelligence Avril Haines. Burns notably traveled to Moscow last fall reportedly to confront Russian President Vladimir Putin over the troop buildup on Ukraine's borders and his plans to invade the country.

Publicly and privately, lawmakers have criticized the Biden administration over the pace and scope of intelligence sharing with Ukraine over the last week.

The officials will also testify before the Senate later in the week.

-ABC News' Ben Siegel

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