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Klitschko brothers release solidarity message for Ukraine (0:43)

Wladimir and Vitali posted a message of support. It was 0: 43.

5:31 PM ET

The mayor of the capital of Ukraine, Vitali Klitschko, plans to take up arms to defend against Russia.

"It's already a bloody war," said a Hall of Fame boxer on Good Morning Britain. I have no other choice. I have to do that. I would fight.

The head of the Kyiv City State Administration was also the mayor. The protests against closer ties with Russia were led by Klitschko. As the city of Kyiv is under siege along with other parts of the country, the leader of the defense is his brother Wladimir, who is also a Hall of Famer.

As the country braced for an attack, Wladimir enlisted in the reserve army.

The Russian president is making it clear that he wants to destroy the Ukrainian state and its people. Death and destruction come upon us. We will fight for freedom and democracy.

Active boxers from Ukraine are being impacted by the invasion. Two-time Olympic gold medalist and three-division champion, Vasiliy Lomachenko, fled Ukraine for Greece.

Oleksandr Usyk, who defeated Anthony Joshua in September, was in London earlier this week for a meeting related to an upcoming boxing video game, but was back in Ukraine on Thursday.

Usyk said in the video that he was at work but he was back. All of us have to stop this war.

Viktor Postol, a former 140-pound champion, is fighting Gary Antuanne Russell on Saturday in Las Vegas.

Postol said at the news conference that he tries to focus on the fight and not on the news. My family is safe and I will have my people there.