The diplomatic mission informs about this on his Twitter page.

Today, #US Ambassador Sullivan visited #PaulWhelan in Lefortovo jail. Paul’s health and well-being is of great concern to the US government. @ MID_RFpic.twitter.com / p8pWkNiuNC

- US Embassy in the Russian Federation (@USEmbRu) January 30, 2020

“Today, the US ambassador Sullivan visited Paul Whelan in the Lefortovo jail,” the statement said.

It is noted that the United States government is concerned about Whelan's health.

Whelan's brother, David, had previously blamed U.S. authorities for inaction.

In December 2018, the FSB reported that Paul Whelan was detained during an espionage campaign in Moscow.