US President Joe Biden on Thursday jokingly warned Wagner Group leader Yevgeny Prigozhin to watch what he eats following a failed coup in Russia last month.

“If I were he, I’d be careful what I ate; I’d keep my eye on my menu,” Biden quipped at a news conference in Helsinki.

Prigozhin’s whereabouts are currently unknown after his brief attempt to march towards Moscow ended less than 24 hours after it began.

Earlier this week, Kremlin spokesman Dmitry Peskov confirmed that Russian President Vladimir Putin met with Prigozhin days after the short-lived rebellion.

Peskov said the three-hour meeting took place at the Kremlin on June 29 and also involved commanders from the military company Prigozhin founded.

The Wagner Group leader was first thought to have been exiled to Belarus, but that country’s President, Alexander Lukashenko, last week hinted that Prigozhin could still be in Russia.