Russia-Ukraine updates: US sanctions Russian military shipbuilder, diamond miner

Ukrainian President Volodymyr Zelenskyy issued a new address Saturday updating the progress of the country's defense against Russian forces.

Ukrainian forces are regaining control of the Kyiv and Chernihiv regions, according to the president.

"There are more and more Ukrainian national flags in the areas that have been temporarily occupied," Zelenskyy said.

Zelenskyy, however, said his country hasn't received any new weapon systems from the West and chastised Western allies.

"Every Russian missile that hit our cities and every bomb dropped on our people, on our children, only adds black paint to the history that will describe everyone on whom the decision depended; [the] decision whether to help Ukraine with modern weapons," he said.

-ABC News' Jason Volack

Acclaimed Ukrainian photographer Maksim Levin was found dead by police in the Kyiv region, a Ukrainian online publication confirmed.

Levin went missing on March 13 while covering fighting in the village of Moshchun, Ukraine, with Oleksiy Chernyshov, who has not yet been found. Intense fighting broke out in the area where they were.

-ABC News' Yulia Drozd

The Ukrainian national flag was raised above the Chernobyl nuclear power plant Saturday at 11:00 a.m. local time, as workers sung the national anthem and celebrated the departure of Russian troops who had occupied the site for weeks.

"The flag-raising ceremony was attended by the station's operational personnel, who have been ensuring and continue to ensure the nuclear and radiation safety of the facilities during the difficult conditions of the occupation," Energoatom, Ukraine's state enterprise which operates its nuclear power stations, posted on its Telegram channel.

Roscosmos, the Russian state space corporation, said it will present the Russian government with proposals for discontinuing international cooperation on the International Space Station.

"Specific proposals from Roscosmos on the timeframe for ending cooperation on the ISS with the space agencies of the United States, Canada, the European Union and Japan will be submitted to our country's administration in the near future," Roscosmos CEO Dmitry Rogozin said on his Telegram channel.

Resumption of normal cooperation with ISS partners is only possible if the sanctions are fully lifted, Rogozin said.

"I believe that restoration of normal relations between the partners on the International Space Station and other joint projects is possible only if the illegal sanctions are lifted fully and unconditionally," he wrote.