People, including relatives of Ukrainian service members killed in a military conflict with pro-Russian rebels in the country's eastern regions, take part in the March of Defenders of Ukraine on Independence Day in Kyiv, Ukraine August 24, 2021.

Spectators attend the Independence Day military parade in the Black Sea port of Odessa, Ukraine August 24, 2021.

Ukrainian Antonov An-225 Mriya cargo plane, the world's biggest aircraft, flies during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian military planes fly in formation during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian military planes fly in formation during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members drive tanks during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian military helicopters fly in formation during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Spectators watch armoured vehicles driving past during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021. REUTERS/Gleb Garanich

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members take part in the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukraine's President Volodymyr Zelenskiy awards Andriy Shevchenko, the former head coach of the men's national soccer team, before the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Slovak service members drive during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Spectators watch the Buk air defense missile systems driving past, during the Independence Day military parade, in Kyiv, Ukraine August 24, 2021.

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

U.S. Army service members march during the Independence Day military parade in Kyiv, Ukraine August 24, 2021.

Ukrainian military vehicles with drones on top drive past, during the Independence Day military parade, in Kyiv, Ukraine August 24, 2021.