A boy poses for a photo with Polish soldiers in front of a tank during celebrations of the 100th anniversary of the Battle of Warsaw in Warsaw, Poland, August 15, 2020. (Photo by Jaap Arriens/Xinhua)

People look at a tank during celebrations of the 100th anniversary of the Battle of Warsaw in Warsaw, Poland, August 15, 2020. (Photo by Jaap Arriens/Xinhua)

A man in a traditional Polish army uniform is seen during celebrations of the 100th anniversary of the Battle of Warsaw in Warsaw, Poland, August 15, 2020. (Photo by Jaap Arriens/Xinhua)

A man dressed in a traditional Polish army uniform is seen during celebrations of the 100th anniversary of the Battle of Warsaw in Warsaw, Poland, August 15, 2020. (Photo by Jaap Arriens/Xinhua)