Analysis-Trump threatens new Iran escalation and risks repeating old mistakes

By Matt Spetalnick WASHINGTON, July 16 (Reuters) - President Donald Trump has ramped up U.S. air strikes on Iran and threatened broader escalation, but there is little sign that a military strategy that has already failed to extract concessions from Tehran will succeed this time. With the collapse of an interim ceasefire deal reached a month ago, Trump – unable to disentangle the U.S. from the unpopular war he started - finds himself in a bind as he seeks to break Iran’s grip on the vital…