Vladimir Putin mentioned Bill Browder's name at his joint press conference with Trump in Helsinki on Monday. Browder is a financier behind the Magnitsky Act, which authorizes governments to sanction Russian human rights offenders and freeze their assets. The act is believed to threaten much of Putin's personal wealth, which is tied up in foreign assets. Putin offered to allow US officials to interview Russians suspected of interfering with the 2016 elections in exchange for interviewing people close to Browder. Vladimir Putin spontaneously singled out one man who poses a unique threat to the Russian leader's massive fortune at Monday's press conference, and it may hint at one of Putin's greatest weaknesses. The man in question is Bill Browder, a US-born British financier behind the Magnitsky Act, which authorizes governments to sanction human rights offenders in Russia, freeze their foreign assets, and ban them from entering the signing country.See the rest of the story at Business InsiderNOW WATCH: North Korean defector: Kim Jong Un 'is a terrorist'See Also:Trump and Putin could be reigniting talks to create a cybersecurity task force, an idea experts shot down last yearPutin just confirmed he wanted Trump to win the 2016 electionTrump declines to say whether he holds Russia accountable for anything, saying the US has been 'foolish'SEE ALSO: No one knows Putin's exact net worth, but many speculate he's the wealthiest person on the planet — his $1 billion palace and $500 million yacht explain why