Packed squares and boulevards across Europe sounded like soccer stadiums Friday as crowds from Paris to Tbilisi, Georgia, cheered Ukrainian President Volodymyr Zelenskyy, who addressed the public gatherings via video.

"Come out and support Ukraine as much as you can," the media-savvy leader, a former actor who has captured the world's admiration for standing up to Russia as it continues to attack Ukraine, urged the crowds.

Ralliers held signs protesting the Russian invasion, which enters its 10th day Saturday. Many waved blue and yellow Ukrainian flags and sang along to anti-war songs like John Lennon's "Imagine."  

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Other cities holding rallies included Frankfurt, Prague, Bratislava, Vienna and Vilnius. 

Zelenskyy has quickly become a symbol of his country’s resilience and determination to fight for its sovereignty. 

The image of Ukrainian President Volodymyr Zelenskyy is seen on a video screen at a pro-Ukraine rally in Romerberg Square in Frankfurt, Germany, March 4, 2022.  (Associated Press)

"If we will fall, you will fall – so please don't be silent, do not turn the blind on eye on this," he said in the message, in which he pleaded for public support. "If we win, and I'm sure we'll win, this will be the victory for the whole democratic world."

People, including Ukrainians, take part in a demonstration of support for Ukraine, in the center of Tbilisi, Georgia, Thursday, Feb. 24, 2022.  (Associated Press)

He said Ukrainians were dying for "protecting your Europe."

"This is our heart, this is the heart of Ukraine, standing together against the evil," he added.

A speech by Ukrainian President Volodymyr Zelenskyy is streamed live on a big screen to a crowd outside the Parliament building in Tbilisi, Georgia, March 4, 2022. (Getty Images)

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Also, Friday Zelenskyy sharply criticized NATO for refusing to implement a no-fly zone over Ukraine. 

"Knowing that new strikes and casualties are inevitable, NATO deliberately decided not to close the sky over Ukraine," he said. "All the people who die will die because of you." 

Thousands of demonstrators gather around the Parliament building in Tbilisi, Georgia, during a protest against Russia's attacks on Ukraine, March 04, 2022. Ukrainian President Volodymyr Zelenskyy addressed the rally in a video message. (Getty Images)

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Meanwhile, in Serbia, protesters rallied in support of Russia after the country rejected calls from the European Union to sanction the Kremlin, with the government citing national interests. 

People hold a large Russian flag during a rally in support of Russia in Belgrade, Serbia, Friday, March 4, 2022.  (Associated Press)