Surging crowds broke through police lines in Georgia at a square where President Bush was expected to speak on Tuesday.
Thousands of people poured on to Freedom Square despite strict security, with barricades smashed to the ground.
Georgia's US-educated president, Mikhail Saakashvili, said as many as 150,000 people had gathered to hear Mr Bush. The crowd enthusiastically yelled, "Bushy, Bushy" during the President's speech.
Jealous at the attention President Bush is receiving from the crowds in the former Soviet republic, Russian leader Vladimir Putin played the old umbrella-that's-really-a-satellite-dish trick on him.