Brexit will be a "boon to the terror groups already active inside and outside Europe’s borders, to the Russian dictator who is crashing through those borders, and it would reduce the ability of the UK and Europe to resist these assaults."
The Tory secretary also claimed the British Army “kicked the backside of Tsar Nicholas I in 1853 in Crimea” and claimed “we can always do it again”.
His comments come as Chelsea's billionaire owner Roman Abramovich "has been effectively barred from living in Britain."
Trump said Putin had responded to the "weakness and incompetence and stupidity" of the Biden administration.
"He cynically supports the European and American far right, up to and including support from clandestine intelligence services and financial assistance."
"Putin declares a big portion of Ukraine as independent. That's wonderful. How smart is that? This is genius."
Labour said Johnson should go further - and called out Russian donations to the Tory party.
"Macron and Putin agree to settle Ukraine's fate over a game of air hockey."
Commons Defence Committee chairman Tobias Ellwood added that ‘we have allowed this to happen’.