Trump's gambit to move ships through the Strait of Hormuz tests the fragile ceasefire

President Donald Trump's initiative to guide ships through the Strait of Hormuz was a high-stakes, high-risk attempt to jolt loose a resolution to the standoff that had come to define his war against Iran.

But the gambit has put the US' fragile ceasefire with Iran under strain, as US and Iranian forces traded fire in the contested waterway. Now, no one is entirely sure whether the tenuous peace can hold long enough for halting negotiations to yield some resolution.