The Latest Breaking News from Simon Tisdall

Letters: Donald Trump embodies a collective madness

The notion that he will claim a victory and stop now is deluded. He will press on until there is the political will in the US to stop him, says Simon Tisdall, the Observer’s foreign affairs commentator

The killing of Hamas’s political leader has raised tensions yet again. Only a ceasefire in Gaza offers any prospect of peace, says the Observer’s foreign affairs commentator Simon Tisdall

Whoever wins the nomination, a fresh choice will be on offer – a far better scenario than a grudge match between two grumpy old men, says Simon Tisdall, the Observer’s foreign affairs commentator

Kim enjoys the recognition. Putin’s war, meanwhile needs North Korean weapons. It’s a dangerous alliance, says Simon Tisdall, the Observer’s Foreign Affairs Commentator

Benjamin Netanyahu and his associates are already doubling down against these allegations. They must be made to answer them, says foreign affairs commentator Simon Tisdall

The Israeli PM has rejected the latest deal. Both he and Hamas’s leadership must stop playing politics with people’s lives, says Simon Tisdall, the Observer’s foreign affairs commentator

Sixteen senior psychologists reveal how their profession failed young people at Gender Identity Development Service clinics

Letters: Ruth Rosenthal reflects on Tehran’s mission to dominate the Middle East, Adrian de León has little faith in diplomatic channels, Phil Tate takes issue with David Cameron’s remarks, Alfredo Louro fears the game is rigged, and the Rev Graham Murphy says the UK’s position is hypocritical