U.S. President Donald Trump and Russia's President Vladimir Putin attend a joint press conference after a meeting at the Presidential Palace in Helsinki, on July 16, 2018. (Xinhua/AFP PHOTO)

MOSCOW, July 24 (Xinhua) -- Russian President Vladimir Putin and his U.S. counterpart Donald Trump may meet on the sidelines of international events, and no preparations are underway for a proposed summit between them in Washington, the Kremlin said Tuesday.

The two leaders will possibly meet at the G20 summit in Buenos Aires later this year and there are other options as well, Kremlin aide Yuri Ushakov said.

Ushakov said that a few days after the Putin-Trump meeting on July 16 in Helsinki, U.S. National Security Advisor John Bolton proposed a next meeting between the two presidents in Washington by the end of the year.

But no practical preparations for this meeting have begun, he said, adding that Putin has no plans yet to participate in the 73rd session of the United Nations General Assembly scheduled to open on Sept. 18.