KEY POINTS

• Trump seen as unpredictable but national security expert says that's not necessarily thing.
• More willing to use military option and with less micromanagement than Obama.
• Ratcheted down tough talk on NATO alliance but still pushing burden sharing.
• North Korea nuclear threat led to softening of administration's China policy.

President Donald Trump applauds aboard the pre-commissioned USS Gerald R. Ford aircraft carrier in Newport News, Virginia, March 2, 2017.

One thing has become abundantly clear after watching President Donald Trump abandon some long-held positions on foreign commitments: he's unpredictable.

"He's a bit more unpredictable than people thought," said Ed Turzanski, an international policy and national security expert at the Foreign Policy Research Institute, a think tank in Philadelphia. "It may not be a bad thing for us relative to our adversaries because strategic ambiguity is valuable."