Tehran -- A court in Iran on Thursday ordered the United States government to pay over $4 billion to the families of Iranian nuclear scientists who have been killed in targeted attacks in recent years, state-run media reported. The largely symbolic ruling underscores the escalating tensions between Iran and the West over Tehran's rapidly advancing nuclear programme, with negotiations to restore the tattered atomic accord at a standstill. Although Tehran has blamed Israel in the past for slayings targeting Iranian nuclear scientists since a decade ago, Iran did not directly accuse its arch-foe Israel in its announcement. Iran has not...