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

The bridge between Russia and Crimea was partially destroyed on Saturday, Ukrainian officials said.

Ukraine's Ministry of Defense said the Kerch Bridge had "gone down."

"The guided missile cruiser Moskva and the Kerch Bridge -- two notorious symbols of Russian power in Ukrainian Crimea -- have gone now," the ministry said on Twitter, referencing Russia's Moskva vessel, which was destroyed in April. "What's next in line, russkies?"

Videos and photos posted by official Ukrainian accounts on social media on Saturday appeared to show the aftermath of an explosion, with plumes of smoke rising above the water.

At least one section of the bridge appeared to have partially fallen into the Kerch Strait, the waterway between the Sea of Azov and the Black Sea.

A railway bridge running alongside the vehicle bridge also appeared to be damaged.

A source in the Kremlin said Saint Petersburg, Russia, authorities choosing to cancel Christmas and New Year citywide events to funnel the funds toward the war in Ukraine is premature, according to Russian News Agency Interfax.

"We consider it clearly premature and undeveloped," the source said according to Interfax.

The Russian Defense Ministry also said its armed forces have all the necessary equipment for the war in Ukraine, saying there is no need to cancel events in Russian regions to save funds for military personnel, said Colonel-General Viktor Goremykin, Deputy Minister of Defense of the Russian Federation.

Earlier on Friday, St. Petersburg officials announced they had decided to cancel the planned festivities and the funds would be used to equip the mobilized. A similar decision was made by the authorities of the Leningrad region.

-ABC News' Natalia Shumskaia

Shelling outside the Zaporizhzhya nuclear power plant, Europe's largest, damaged the power line to one of the reactors, International Atomic Energy Agency Director General Rafael Grossi said Friday.

The damage was caused to reactor six on Thursday, forcing the unit to temporarily rely on emergency diesel generators, according to Grossi.

Two of the experts who had been at the plant for over five weeks, were replaced Friday. There are now four IAEA experts at the Zaporizhzhya plant.

"Again and again, the plant’s courageous, skilled and experienced operators find solutions to overcome the severe problems that keep occurring because of the conflict. However, this is not a sustainable way to run a nuclear power plant. There is an urgent need to create a more stable environment for the plant and its staff," Grossi said in a statement.

-ABC News' Alexandra Faul

After President Joe Biden made comments suggesting Russia may use nuclear weapons, the White House says there is no new information to suggest an imminent threat.

White House Press Secretary Karine Jean-Pierre said Biden's comments have been "very consistent" and he was reinforcing how seriously the U.S. takes Russia's threats about using nuclear weapons.

"Russia's nuclear rhetoric has been reckless and irresponsible. But if the Cuban missile crisis has taught us anything, it is the value of reducing nuclear risk and not brandishing that," she said speaking to reporters Friday.

Jean-Pierre also called Putin's comments irresponsible as a leader of a nuclear power.

"We won't be intimidated by Putin’s rhetoric, we have not seen any reason to adjust our own nuclear posture, nor do we have indications they are prepared to use them but Putin can de-escalate this at any time, and there is no reason to escalate," Jean-Pierre said.

-ABC News' Sarah Kolinovsky