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 visited Mariupol to inspect a number of locations in the city and talk to local residents, the Kremlin press service said on Sunday.

Putin travelled by helicopter to the Ukrainian city, which has been occupied since last year by Russians. He drove a vehicle along the city's streets, making stops at several locations.

The visit was Putin's first to newly annexed territories.

Deputy Prime Minister Marat Khusnullin reported to Putin about construction and restoration work. In the Nevsky area, a newly built residential area, Putin talked with residents. He went inside a home at the invitation of one of the families.

Putin also inspected the coastline of the city in the area of a yacht club, a theater building that was heavily bombed with civilians sheltering inside and other memorable places of the city.

-ABC News' Tanya Stukalova