Leaders of the Group of Seven wealthy nations have mocked the macho image of Vladimir Putin at a meeting in Germany dominated by the Russian president’s invasion of Ukraine.

As the leaders sat down for their first meeting of the three-day G7 summit in the sweltering Bavarian Alps on Sunday, the British prime minister, Boris Johnson, asked if their jackets should come off – or if they should even disrobe further.

“We all have to show that we’re tougher than Putin,” Johnson said, to laughter from some of his colleagues. Johnson suggested the leaders “show them our pecs”.

“Bare-chested horseback riding,” suggested Canada’s Justin Trudeau. “Oh yes,” said European Commission president, Ursula von der Leyen. “Horseback riding is the best.”

Putin has been pictured shirtless several times in photos released by Russian state media, including one set in which he rode a brown horse while wearing wrap-around sunglasses, a gold chain and army trousers.

Another image from 2010 shows a bare-chested Putin carrying a hunting rifle during a trip in southern Siberia, while yet another shows the Russian leader wearing a wetsuit, carrying artefacts recovered while diving at an archaeological site off the Taman peninsula.