Boris Johnson has unveiled a six-point plan he hopes will ensure Russia fails in its “horrific” invasion of Ukraine.
The prime minister said “it is not future historians but the people of Ukraine who will be our judge” over how the world reacts to Vladimir Putin’s “hideous, barbarous assault”.
He added: “Putin must fail and must be seen to fail in this act of aggression.
“It is not enough to express our support for the rules-based international order – we must defend it against a sustained attempt to rewrite the rules by military force.”
Mr Johnson is set to call on his counterparts around the world to come together under a six-point plan in an essay in the New York Times on Sunday.
He will call on leaders to mobilise an “international humanitarian coalition” for Ukraine and support the country “in its efforts to provide for its own self-defence”.
He will say the economic pressure on the Kremlin should be ratcheted up, while leaders resist the “creeping normalisation” of what Russia is doing in Ukraine.
Mr Johnson will also say diplomatic paths to resolving the war must be pursued and that there needs to be a “rapid campaign to strengthen security and resilience across the Euro-Atlantic area”.