Tehran, June 5 -- Iranian officials and hardline media have adopted a markedly tougher tone towards Washington following the most serious US-Iran military confrontation in weeks, despite US President Donald Trump insisting that negotiations remain on track and a deal could still be reached.

The latest escalation began early Wednesday when US forces struck a telecommunications tower on Qeshm Island. Tehran responded by announcing attacks on American military facilities in Gulf states such as Kuwait and Bahrain, placing further strain on the fragile 56-day ceasefire that has managed to largely hold despite recurring tensions.

Kuwaiti authorities said an Iranian drone struck Kuwait International Airport, killing one person and injuring dozen...