The FBI has for years being observing the activities of the apparent head of China's spy operations in the USA - a bloke by the name of Ho - and even got a FISC approval to deal with him. In the end they searched his office and his home and arrested him. First call he asked to make was to Hunter Biden to cut a deal with him. The answer is not clear - an amount of $6 million was mentioned.
The Biden's have been in regular telephonic and personal contact with Ho and various business deals followed - inclusive of the sale of 1 million barrels from the strategic oil reserve to a Chinese Company. The fact is that the FBI is aware of the situation and has been for years. They did nothing about it and when questioned in the House - the answer given was that the FBI will not provide details on an ongoing investigation. When it came out there was NO ongoing investigation - the answer was no info would be provided on a "potential investigation".
So the answer is - who is the main handler of the Biden's and the answer is simple - President Xi of China. The protection racket of the FBI is betraying the national interests of the USA.