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

The United States is committed to stopping Russia from obtaining foreign weapons, including Iran-made drones, a State Department official said.

Officials from the United States, United Kingdom and France on Thursday raised the issue during a meeting of the U.N. Security Council, State Department spokesman Ned Price said.

"The United States began warning in July that Iran was planning to transfer UAVs to Russia for use in Russia's brutal war against Ukraine, and we now have abundant evidence that these UAVs are being used to strike Ukrainian civilians and critical civilian infrastructure," Price said. "As Iran continues to lie and deny providing weapons to Russia for use in Ukraine, we are committed to working with allies and partners to prevent the transfer of dangerous weaponry to Russia."

He added, "We will not hesitate to use our sanctions and other appropriate tools on all involved in these transfers."

-ABC News' Matthew Seyler

Secretary of State Antony Blinken told "Good Morning America" anchor George Stephanopoulos in a new interview that Russian President Vladimir Putin's declaration of martial law in illegally annexed parts of Ukraine "speaks to his desperation" as Ukrainian forces continue to make progress in rebuffing the invasion.

"Just in the last few weeks, he's tried to mobilize more forces. He's gone through with this sham annexation of Ukrainian territory," Blinken said in a preview from the sit-down, which will air Thursday on "Good Morning America."

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Blinken responds to Putin’s declaration of martial lawU.S. Secretary of State Antony Blinken spoke with ABC News’ George Stephanopoulos about Russian measures against Ukraine.

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-ABC News' Tal Axelrod

Ukraine will start restricting electricity supplies across the country on Thursday after Russia knocked out more power plants, a senior aide to Ukrainian President Volodymyr Zelenskyy, Kyrylo Tymoshenko, said on Wednesday.

"From 7 a.m. to 11 p.m., it is necessary to minimize the use of electricity ... if this is not done, you should prepare for temporary blackouts," Tymoshenko wrote in a Telegram post.

-ABC News' Jason Volack

President Joe Biden reacted to Russian President Vladimir Putin's decision to impose martial law in illegally annexed Ukrainian areas, telling reporters it may be his only tool available.

"I think that Vladimir Putin finds himself in an incredibly difficult position. And what it reflects to me is it seems his only tool available to him is to brutalize individual citizens, in Ukraine, Ukrainian citizens to try to intimidate them into capitulating," Biden said Wednesday.

"They're not gonna do that," he added

-ABC News' Molly Nagle