The United States is freeing a Russian cybercrime boss from prison in return for Moscow's release of American schoolteacher Marc Fogel, U.S. administration officials said on Wednesday.

Fogel was sentenced to 14 years in prison in Russia, which the U.S. has condemned as a wrongful detention, after a small amount of medical cannabis was found in his luggage.

Russia says its citizen will return from the US in the coming days, after Trump hailed the release of American Marc Fogel.