Russian missiles hit Kyiv as G7 summit begins in Europe - CNN

Speaking to CNN onsite, Klitschko said Russia's war on Ukraine was "senseless" and thousands of civilians had died, and added, "We have to do everything to stop this war."

The Ukrainian State Emergency Service said the fire was caused by "enemy shelling" and was over an area of 300 square meters, in "a 9-storey residential building with partial destruction of the 7th, 9th and 9th floors."

The same neighborhood was hit by a missile strike in early May, and was also targeted in March.

Vadym Denysenko, an adviser to the Minister of Internal Affairs, said on Ukrainian television that there are "a number of military infrastructure facilities located in the Shevchenkivskyi district of the Ukrainian capital.

However, Ukrainian forces continue to defend the neighboring city of Lysychansk, which is coming under growing Russian artillery and rocket attacks.

On Sunday, the head of the neighboring Donetsk region's military administration, Pavlo Kyrylenko, said Russian forces were gathering for fresh assaults in the region, nearly half of which is under Ukrainian control.

"We are now witnessing the accumulation of manpower, heavy armored vehicles and artillery in the direction of Sloviansk," Kyrylenko said on Ukrainian television.

Kyrylenko said there had been a missile strike and rocket attacks on Kurakhove, a town on the southern front line in Donetsk that has been a target of Russian attacks for more than two months.

Avdiivka had also been hit by rockets, he said.

As Russian forces step up the momentum of their offensive in eastern Ukraine, the city of Kharkiv and surrounding areas have come under increasing artillery fire again.

Russian Defense Minister Sergey Shoigu also visited Russian troops involved in what the Kremlin has called the special military operation in Ukraine, according to the Defense Ministry.

Video released by the news agency RIA Novosti shows Shoigu disembarking from a helicopter in an unknown location and meeting officers inside what appears to be a command center.

The Telegram channel of the Russian Defense Ministry said Shoigu "listened to reports from commanders on the current situation and the actions of the Russian Armed Forces in the main operational areas at command posts."

Shoigu is also seen conferring medals on several soldiers, including "the Gold Star Medals of the Hero of the Russian Federation and the Order of Courage," according to the Telegram post.

Together, the G7 will announce that we will ban the import of Russian gold, a major export that rakes in tens of billions of dollars for Russia."

Biden also remarked on the unity of the G7 and NATO on Ukraine and the Russian invasion, telling German Chancellor Olaf Scholz that the G7 and NATO will stay together and not "splinter."

British Prime Minister Boris Johnson said the price of allowing Russian President Vladimir Putin to "continue with his program of conquest" is far higher than the current cost.

"The price of backing down, the price of allowing Putin to succeed, to hack off huge parts of Ukraine, to continue with his program of conquest, that price will be far, far higher.