DUBAI (Reuters) – Iran’s supreme leader promised on Saturday to retaliate for the assassination of the Islamic Republic’s top nuclear scientist, who the West and Israel believed was the architect of a secret Iranian programme to make weapons. Slideshow ( 3 images ) Ayatollah Ali Khamenei, Iran’s top authority who says Tehran has never sought nuclear arms, promised in his statement on Twitter to continue the work of Mohsen Fakhrizadeh, who died on Friday after gunman ambushed him in his car near Tehran. The killing, which Iran’s president was swift to blame on Israel, threatens to spark a new Middle East confrontation in the final weeks of U.S. President Donald Trump’s term. It could also complicate any efforts by President-elect Joe Biden to revive a detente with Tehran that was forged when he was in Barack Obama’s administration. Trump pulled Washington out of the 2015 international nuclear pact agreed […]