Boris Johnson
The former PM told the Russian president the Russian empire was "over, over, over".
But a campaigner said the explanation is "very thin, inadequate and lacking in evidence".
"They will soon run out of Ukrainians willing to fight," the Russian president claimed.
"Even as a cry for attention, this is a little desperate."
The Succession star once branded Johnson a "compulsive liar" during his time in Downing Street.
The former prime minister took exception to the comparison.
The new Tory leader also said Boris Johnson was a "great" prime minister even though she resigned from his government.
Backing for the ex-president has ever so slightly crept up over the last eight years.
Liz Truss, Boris Johnson, Robert Jenrick and Nigel Farage have all weighed in on the upcoming US election.
Even though the former PM did lead the Leave campaign.