Vladimir Putin
"Dangerous actions conducted with increasing recklessness," Ken McCallum said.
South Korea's defence minister warned there's a strong possibility Russia is taking soldiers from the Asian dictatorship.
To think the Russian president had tried to play down the occasion, too.
"Since the start of the conflict, Russia has likely suffered over 648,000 casualties," the MoD said.
The former U.S. national security adviser also likened Trump to U.K. Prime Minister Neville Chamberlain, whose failed foreign policy benefitted Adolf Hitler.
Two months later, and Kyiv's small – albeit astonishing – occupation of Russian territory is going strong. Western officials don't understand how.
Unlike Trump, the former PM is celebrated in Ukraine for supporting them after Russia's invasion.
Ukraine's representative to the UK, Valerii Zaluzhnyi, issued the bleak prediction at the Conservative Party conference.
It comes as the Russian leader adds an extra 133,000 conscripts to his army.
Meanwhile, the Russian president himself has been waxing lyrical about the "truth".