Russia-Ukraine updates: Putin suspends key US-Russia nuclear treaty in speech denouncing West

The White House reiterated its warning Friday that there is a risk Russia may consider the use of nuclear weapons, but there are no indications of an "imminent use of nuclear weapons."

"I've been clear myself, President Biden has been clear, the administration has been clear that there is a risk given all of the loose talk and the nuclear saber rattling by Putin, that he would consider this and we've been equally clear about what the consequences would be," National Security Advisor Jake Sullivan said.

Asked if the threat was higher now than it was at the start of the invasion of Ukraine, Sullivan wouldn't characterize a risk level, but noted that "the risk has been there from the start."

Sullivan added, "What's interesting is that at various points over the course of this conflict, including right at the outset, Putin has brandished the nuclear card. He's doing it again."

Asked by ABC's Terry Moran about Vladimir Putin's speech Friday, accusing the U.S. and the West of values equal to "Satanism" and attacking "liberal values," Sullivan said, "its raving."

-ABC News' Terry Moran and Justin R. Gomez

After President Joe Biden said that the Nord Stream pipeline leaks were a "deliberate act of sabotage," the White House made clear the U.S. isn't yet attributing who is behind those attacks, but told ABC's Terry Moran that they "do not believe that this was the work of any NATO ally."

National Security Advisor Jake Sullivan was careful not to directly blame Russia, though he didn't rule out the possibility they were behind it given their response to the attacks.

"Russia has done what it frequently does when it is responsible for something, which is make accusations that it was really someone else who did it," Sullivan said.

Sullivan said the U.S. can "unequivocally" say that the "suggestions Russia has made about the United States and other countries are flat out false."

When asked how many other countries have the capabilities to even carry out this kind of attack, Sullivan said, "not many."

Asked if the White House is concerned that there could be an attack on U.S. and Western infrastructure after the Nord Stream incident, he said "we have been concerned about that from the beginning of the war," but didn't have specific intelligence to share on current threats.

-ABC News' Terry Moran and Justin R. Gomez

President Joe Biden condemned Russia's "fraudulent attempt today to annex sovereign Ukrainian territory" in a statement Friday.

"Make no mistake: these actions have no legitimacy. The United States will always honor Ukraine's internationally recognized borders. We will continue to support Ukraine's efforts to regain control of its territory by strengthening its hand militarily and diplomatically, including through the $1.1 billion in additional security assistance the United States announced this week," Biden wrote.

Biden also said the U.S. and its partners would be imposing new sanctions on individuals and entities inside and out of Russia "that provide political or economic support to illegal attempts to change the status of Ukrainian territory."

He added, "We will rally the international community to both denounce these moves and to hold Russia accountable. We will continue to provide Ukraine with the equipment it needs to defend itself, undeterred by Russia's brazen effort to redraw the borders of its neighbor. And I look forward to signing legislation from Congress that will provide an additional $12 billion to support Ukraine."

-ABC News' Molly F. Nagle

In the wake of Russian President Vladimir Putin saying he has annexed occupied territories in Ukraine, Ukrainian President Volodymyr Zelenskyy said Ukraine is applying for "accelerated accession" to NATO, saying it is already de-facto allied with the alliance's members.

"Today, here in Kyiv, in the heart of our country, we are taking a decisive step for the security of the entire community of free nations," he said in a statement.