Biden’s Putin ad-lib should focus west on what its endgame should be

Analysis: Any unseating of Russia's president is that country's business, not that of the US president

• Russia-Ukraine war: latest updates

At the end of what had been a largely flawless visit to Europe, during which he focused on the misery Vladimir Putin was imposing on Russia, Joe Biden closed his 27-minute speech on Saturday evening in Warsaw by conjuring up the image of a less popular US president - George W Bush - when he said: For God's sake, this man cannot remain in power."

The US president has previously called Putin a killer, a pure thug, a war criminal and a butcher, but he had never advocated regime change, risking turning the war for the defence of Ukraine to a familiar one of American aggression.