Simon Tisdall

The US constitution protects incompetence. But don’t underestimate the self-destructive power of the president’s own hubris, says Guardian foreign affairs commentator Simon Tisdall

In his final column, the Observer’s foreign affairs commentator says America under Trump is not the first time it has caused trouble for allies

His attempts to bully and exploit the weak hark back to an era when the US emulated the worst aspects of the British empire

Israel never intended to honour the ceasefire. These airstrikes mark a dire new phase in the conflict says Observer foreign affairs commentator Simon Tisdall

After just a few weeks in the White House, the self-appointed peace-giver has stoked war, accelerated the nuclear arms race and alienated US allies

The strange warmth between the leaders has sent a chill globally at the prospect of a troika of authoritarian states

The world’s most admired democracy is being held hostage by a clique of far-right thugs. It would be a mistake to placate them, says the Observer’s foreign affairs commentator Simon Tisdall

In a fast-moving crisis, the EU hasn’t been nimble enough. The onus must fall on ‘coalitions of the willing’ to stop a US-Putin carve-up

With a Putin-appeasing president at the helm, it is clear the transatlantic alliance is collapsing and European leaders must plot their own course

Development of a joint defence shield would be politically explosive for Keir Starmer. But it’s an idea whose time has come, says the Observer’s foreign affairs commentator Simon Tisdall