Vladimir Putin and Donald Trump have agreed to a prisoner swap days after the US president branded his Russian counterpart 'crazy.'

The prisoner swap was revealed Tuesday by Russia's foreign minister Sergey Lavrov, who praised Trump as 'a man who wants results' as he spoke at an event in Turkey.

Lavrov said the prisoner swap was agreed amid negotiations over the end of the war in Ukraine, which he sensationally accused European nations of attempting to 'sabotage.'

The US State Department did not immediately respond to DailyMail.com's request for details on which prisoners are set to be exchanged.

If the latest prisoner swap between the US and Russia goes ahead, it will be the first since American teacher Marc Fogel was returned to the US in February after over three years in a Russian prison.