Updated

A picture has emerged apparently showing Russia's Prime Minister Vladimir Putin in his former days as a KGB officer.

The 20-year old photo depicts two world leaders – U.S. President Ronald Reagan and the Soviet leader Mikhail Gorbachev — in Moscow.

But, according to the man who took the photo, it also captures Putin disguised as a tourist.

Pete Souza, now President Obama's official photographer, captured the moment when he worked for President Reagan during the political thaw that soon ended the Cold War.

Reagan took a stroll around Red Square accompanied by the Russian leader, who then introduced him to a group of tourists.

In an interview, Souza recounted being surprised at the "pointed" questions these supposed tourists asked the U.S. leader.

They included searching inquiries on the state of human rights in the U.S.

The identity of the man on the left of the photo — complete with camera round his neck — was later revealed and "verified" to Souza as none other than Putin.

The planting of KGB officers as bystanders was a common practice in Soviet times.

During the tense stand-off of the Cold War, they would be used to challenge foreign leaders during visits to Russia.

But, while acknowledging this practice, a Russian political analyst and author of books on Vladimir Putin dismissed Souza's claims as "nonsense."

"Vladimir Putin was a major serving in Dresden and he wasn't important enough at that time to be brought to Moscow,"said Andrey Piontkovsky.

Click here to see the photo and to read more on this story from Sky News.