‘Boris Johnson has defended a £160,000 donation made to the Conservatives by a former Russian minister's wife in return for a tennis match with him.
Confirming the 2014 match, which was also set to include David Cameron, took place, he warned against creating a "miasma of suspicion" against Russians.
"To the best of my knowledge, all possible checks have been made and... will continue to be made" on donations.
Lubov Chernukhin had bid at a fundraising auction at a Tory event.
Mr Johnson was mayor of London in 2014. The match was reported at the time - Mrs Chernukhin is a longstanding Conservative Party donor whose husband served under Vladimir Putin.
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The tennis match against Mr Johnson and the then prime minister Mr Cameron was among items auctioned off at the Conservative Party summer ball in the summer of 2014.
Law firm Carter Ruck confirmed at the time that the successful bidder was Mrs Chernukhin, whose husband Vladimir was deputy finance minister under Mr Putin between 2000 and 2002.
Asked about it on BBC One's Andrew Marr Show, Mr Johnson said: "If there is evidence of gross corruption in the way that gentleman in question obtained his wealth... then it's possible for our law enforcement agencies to deprive him of his wealth with an unexplained wealth order - that is a matter for the authorities, it's not a matter for me."
'Quite extraordinary’
I’d forgotten about Johnson’s tennis match fundraiser!
“We are killing like we haven’t killed since 1967”


