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

Russian forces in northern Ukraine have been “largely static,” as Ukrainian resistance and counterattacks have been “hampering” their attempts to reorganize, the UK Ministry of Defence said on Sunday.

“Russian forces appear to be concentrating their effort to attempt the encirclement of Ukrainian forces directly facing the separatist regions in the east of the country, advancing from the direction of Kharkiv in the north and Mariupol in the south,” the Ministry’s update said.

Ukrainian President Volodymyr Zelenskyy reiterated his call for 1% of NATO's arsenal during his latest national address.

"One percent! We did not ask for more. And we do not ask for more. And we have already been waiting for 31 days!" he said.

Zelenskyy, who similarly pleaded for more military aid during an address at this week's NATO summit, said Ukraine is especially in need of more planes and tanks.

"Ukraine cannot shoot down Russian missiles using shotguns, machine guns, which are too much in supplies," he said. "And it is impossible to unblock Mariupol without a sufficient number of tanks, other armored vehicles and, of course, aircraft."

Zelenskyy said Ukraine's minister of foreign affairs and the minister of defense met with U.S. officials, including President Joe Biden, in Poland Saturday to address these "vital interests."

President Joe Biden spoke on the phone with Belarusian opposition leader Svyatlana Tsikhanouskaya from Air Force One, the White House said Saturday.

Biden "underscored the continued support of the United States for the Belarusian people in defending and advancing human rights, including freedom of expression, and free and fair elections," the readout of the call stated.

Tsikhanouskaya attended Biden's address in Warsaw on Saturday, according to the readout.

Belarus has served as a staging area for Russian attacks on Ukraine during the war. Its president, Alexander Lukashenko, is a close ally of Russian President Vladimir Putin.

-ABC News' Armando Garcia

The U.S. will be providing Ukraine with $100 million in "civilian security" assistance, U.S. Secretary of State Antony Blinken announced Saturday, hours after he and Defense Secretary Lloyd Austin met with their Ukrainian counterparts.

The aid will provide equipment including armored vehicles, medical supplies, personal protective equipment and communications equipment, according to the Department of State.

The aid will go to Ukraine’s border guard, law enforcement and government infrastructure protection, Blinken said in a statement.

"With the U.S. government’s vital assistance, Ukrainian law enforcement officers are playing a key role in rescuing victims of the Russian government’s brutal assault, leading and protecting convoys of those displaced by attacks, and providing security to civilian areas torn apart by ruthless and devastating bombing," Blinken continued in the statement.

-ABC News' Conor Finnegan