Stephen Collinson: “As Donald Trump’s critics see it, he’s striking out badly on foreign policy.”“But the president is still taking mighty swings.”“His long-broken memorandum of understanding with Iran reached its 60-day expiration date on Monday. Instead of celebrating a nuclear deal that might have justified his war, Trump vented his frustration by finding some of America’s friends to punish and rekindling his relationship with North Korea’s Kim Jong Un.”