US President Donald Trump and Russian counterpart Vladimir Putin had another, previously undisclosed conversation at this month's G20, the White House has confirmed.
They spoke towards the end of a formal dinner but the White House has not revealed what was discussed.
President Trump has condemned media revelations of the talks as "sick".
The two leaders' relationship is under scrutiny amid allegations of Russian interference in the US election.
US intelligence agencies believe Moscow tried to tip the election in Mr Trump's favour, something denied by Russia. Mr Trump has rejected allegations of any collusion.
The extra conversation happened during a private meal of heads of state at the G20 summit in Hamburg earlier in the month.
Mr Trump left his seat and headed to Mr Putin, who had been sitting next to Mr Trump's wife, Melania, US media said. The US president was alone with Mr Putin, apart from the attendance of the Russian president's official interpreter.
Mr Trump had been seated next to Japanese PM Shinzo Abe's wife, so the US interpreter at the dinner spoke Japanese, not Russian. No media were in attendance.