Donald Trump has claimed victory after his trip to Europe, describing a new era of co-operation with Russia and outlining plans for a joint cyber-security unit to protect against election hacking.

He delivered his verdict in customary style on Sunday morning after returning home from the G20 summit – with a slew of Twitter messages pouring scorn on fake news and his political opponents.

But his plans for a joint cyber unit brought immediate ridicule amid concerns it was a Russian ruse to collect secrets.

The biggest moment of Mr Trump’s second foreign trip was his meeting with Vladimir Putin which came amid continuing questions about whether the American president’s campaign colluded with Russia in efforts to swing last year’s election.