The last line that fed the Zaporizhzhia nuclear plant has been damaged following missile strikes, and the plant is now working on diesel generators, according to the Ukrainian energy minister, Herman Galushchenko.

-ABC News' Will Gretsky

DTEK, the largest private grid operator in Ukraine, said emergency power outages are in effect due to the missile attacks in the Kyiv, Odesa, Mykolaiv and Dnipro regions.

-ABC News' Will Gretsky

Multiple explosions have been reported in city centers all over the country, including Dnipro, Odesa, Kyiv, Zaporizhzhia, Vinnytsia, Khmelnytskyi and Kharkiv.

Residents in multiple areas are being asked to shelter in place, and communication and electricity has been impacted.

Kyiv Mayor Vitali Klitschko said multiple explosions were reported in the Holosiiv district.

The governor of Kharkiv, Oleh Syniehubov, said Russia struck the city at least 15 times overnight.

The head of the Odesa Regional Military Administration said there had been no casualties and that the power supply is being restricted.

-ABC News' Will Gretsky

Ukrainian Defense Minister Oleksiy Reznikov denied Ukraine was involved in the bombing of the Nord Stream pipeline, which carries natural gas from Russia to Germany. While the pipeline was not active at the time of the bombing last September, it was filled with fuel.

The denial comes after The New York Times reported that intelligence reviewed by U.S. officials suggests a pro-Ukrainian group carried out the Nord Stream bombings last year.

After the story broke, German Defense Minister Boris Pistorius warned against “jumping to conclusions” about who carried out the explosion, suggesting it could have been a “false flag” operation to blame Ukraine.

German authorities were reportedly able to identify the boat used for the sabotage operation, saying a group of five men and one woman using forged passports rented a yacht from a Poland-based company owned by Ukrainian citizens. The nationalities of the perpetrators are unclear, according to a separate report by Germany’s ARD broadcaster and Zeit newspaper.

“We have to make a clear distinction whether it was a Ukrainian group, whether it may have happened at Ukrainian orders, or a pro-Ukrainian group [acting] without knowledge of the government. But I am warning against jumping to conclusions,” Pistorius said on the sidelines of a summit in Stockholm.

A Russian diplomat said Russia has no faith in the U.S.‘s “impartiality” in the conclusions made from intelligence.

-ABC News’ Ellie Kaufman

Russian President Vladimir Putin acknowledged Russian military losses from its ongoing invasion of Ukraine during his annual meeting with the federal security service Tuesday.

"Unfortunately, comrade officers, we know that there are losses in our ranks," Putin said.

Putin called on the FSB to provide "support" to the families of soldiers who have died in the war.

"We will always remember their heroism and bravery," he added.

Putin did not say how many soldiers have died in the war and the Russian Ministry of Defense hasn't disclosed an exact number of losses since September 2022 when Defense Minister Sergey Shoigu said just shy of 6,000 troops had died.

Secretary of State Antony Blinken and other State Department officials said Russia has likely suffered 200,000 injured or dead soldiers since the start of the war.

Putin also called on the FSB to make sure its border guard "undertake special efforts to control the Russian state border with Ukraine."

A "special group" is currently deployed at the Russia-Ukraine border, made up of border agencies, the FSB air arm, the Russian Armed Forces and the Russian National Guard, according to Putin.

"Your mission is to prevent any incursions by sabotage groups and stop any attempts to smuggle weapons and ammunition into Russia," Putin told the FSB board.

-ABC News' Tanya Stukalova and Anastasia Bagaeva