What is surprising about last week's U.S. air strikes in Syria is not the fact that U.S. President Donald Trump ordered the launching of missiles — although it adds spice that he apparently did so while hosting the Chinese president at Mar-a-Lago

With his appointment of generals in key national security positions as well as his budget proposals, Trump had already signaled a more muscular, military-oriented approach to foreign policy.

And what that meant in practice has been evident since he came to office in January via the greater U.S. military engagement in Yemen.