MOSCOW, December 8. /TASS/. Titled US-born boxer Roy Jones Jr., officially granted Russian citizenship, has been revealing his sporting techniques for Moscow police — sharing his skills in the ring on Tuesday.

The boxer, 46, thanked Moscow police chief Anatoly Yakunin for the invitation, saying he is "proud" to be part of the city police team and will help train the best boxers, a police statement said.

Jones presented Yakunin with a portrait of Gleb Zheglov, a brilliant police detective from the well-known Soviet film "The Meeting Place Cannot Be Changed." Moscow's police chief handed Jones the certificate of Adviser to the Public Boxing Federation of the Russian Interior Ministry in Moscow.

"We started developing boxing only in 2013. We hope that with the help of Roy Jones, we will have thousands of boxers here," Yakunin said, quipping that "police win their battles with criminals without weapons."

Russian President Vladimir Putin signed a decree to grant Jones citizenship in September. He received his Russian passport at Moscow ceremony in October.

Jones' professional career began in 1989 and has world titles in four weight classes to his credit. At one point, he was considered the world’s top boxer regardless of weight category. He is also a unique sporting figure in being the only fighter winning champion titles in the middleweight, super middleweight, light heavyweight and heavyweight divisions.

In professional boxing he scored 62 wins, including 45 knockouts, and lost eight fights. In 1988, he won a silver medal at the Seoul Olympics.

Jones takes to the Moscow ring on December 12, challenging for the WBA Super Champion title in the light heavyweight class.