Estimates of his personal wealth vary wildly -- officially he owns a small apartment, garage and a few cars
, but at least one estimate puts his personal wealth at up to $200 billion
According to Putin's spokesperson, Dmitry Peskov, suggestions of vast wealth are a "perverted commenting of reality."
The Russian President does, however, have many wealthy friends who are alleged to have benefited from their links to him.
These are the people who make up his inner circle.
As the head of one of the world's largest oil companies, Rosneft, Igor Sechin is one of the most powerful men in Russia.
Like Putin, Sechin has come a long way since the early 1990s when the two men worked together in the St Petersburg mayor's office
. After he followed Putin to Moscow, Sechin continued to work closely with his old boss -- both as his presidential aide and then as deputy prime minister.
In 2014, after Russia annexed Crimea from Ukraine, and after his stint in Putin's administration, Sechin was put under sanctions by the US treasury
which said he had "shown utter loyalty to Vladimir Putin - a key component to his current standing."
With a fortune of about $15.5bn, Gennady Timchenko is ranked 85 on Forbes' billionaires list
Although he has a luxurious lifestyle now -- and played hockey with Putin -- he has not always been so wealthy. Timchenko comes from humble beginnings -- his wife Elena said the couple used to live in a communal apartment
in St Petersburg with "bedbugs and the smell of borscht soup in the kitchen." Their elder daughter, she said, first slept in a suitcase in their room.
Timchenko says he has known Putin for more than 20 years but says "when I am asked questions about our friendship, I always say, please turn to Vladimir Vladimirovich. If I call myself a friend of his, it wouldn't look appropriate."
Timchenko is one of the founders of Gunvor -- a global company that trades in oil and energy markets.