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

The Russian Ministry of Foreign Affairs on Monday imposed new sanctions on 25 Americans, including one of U.S. President Joe Biden's cabinet secretaries, several U.S. senators and two Hollywood actors, all of whom have been outspoken against Russia's war in neighboring Ukraine.

Commerce Secretary Gina Raimondo, Arizona Sens. Mark Kelly and Kyrsten Sinema, Sen. Rick Scott of Florida, Sen. Mike Rounds of South Dakota, Sen. Pat Toomey of Pennsylvania, Sen. Kevin Kramer of North Dakota, as well as actors Ben Stiller and Sean Penn, are banned from entering Russia.

"Through the Armed Services Committee I’ve worked with Republicans, Democrats, and our military leaders to get Ukraine the supplies and weapons needed to beat back this invasion," Kelly, who is up for re-election, said in a statement to ABC News on Tuesday. "If that earns me a sanction by the Kremlin, then that means we’re doing something right."

-ABC News' Libby Cathey

In an exclusive interview with ABC's "World News Tonight" anchor David Muir, Ukrainian President Volodymyr Zelenskyy hinted of more counteroffensives as his country tries to turn the tide of war against Russia.

"It's a very difficult war," Zelenskyy told Muir from the presidential office in Kyiv. "We will regain our territory."

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Zelenskyy signals to David Muir that Kherson is not only counteroffensive underwayUkrainian President Volodymyr Zelenskyy sat down with ABC News’ David Muir in Kyiv and addressed the new push against Russian forces.

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Ukraine's Zaporizhzhya Nuclear Power Plant has lost connection to its last remaining main external power line, the International Atomic Energy Agency said in a statement Saturday.

Zaporizhzhya is continuing to supply electricity to the grid through a reserve line, the IAEA said it was informed while at the site.

Three other power lines were lost earlier during the conflict, the IAEA said.

The information came less than 48 hours after IAEA Director General Mariano Grossi established a presence in the plant.

One reactor is still operating and producing electricity both for cooling and other essential safety functions at the site and for households, factories and others through the grid, the IAEA said.

The power plant has been held by Russian forces since early March, but its Ukrainian staff are continuing to operate the plant.

The head of the United Nations' nuclear watchdog said the situation at the Zaporizhzhia nuclear power plant remains "extremely complex and challenging."

International Atomic Energy Agency Director General Rafael Grossi, who just returned from leading a team of over a dozen experts sent to inspect the besieged plant, said during a briefing Friday that the physical integrity of the building "has been violated not once, but several times," and that the integrity of the power supply to the plant is a major concern.

Grossi said he asked to talk to the Russian military at the plant and "they were not available" and noted that his team was not allowed to access the power plant's "crisis center." He implied that the Russians are using it for some other purpose but that it does "not have an influence on the operation of the plant."

There are currently six IAEA experts at the plant, he said. Four of them are set to leave next week and two will stay for the foreseeable future.

-ABC News' Tom Soufi Burridge