The encounter came only three days after the United States revoked the visa of Venezuela’s ambassador in Washington, in reprisal for Chavez’s rejection of the US president’s appointed ambassador to Caracas.

But Chavez and Clinton were all smiles as they mingled with the presidents of Chile and Colombia and the prime minister of Portugal while waiting to meet Rousseff.

At one point, Chavez extended his hand to Clinton, who shook it, smiling. They chatted for a few minutes before moving on to formally greeting Rousseff.

There were no reports on what was said between them.