Intercontinental ballistic missiles (ICBM) are driven past the stand with North Korean leader Kim Jong Un and other high ranking officials during a military parade marking the 105th birth anniversary of country's founding father Kim Il Sung, in Pyongyang April 15, 2017. Damir Sagolj, Reuters U.S. President Donald Trump has employed tough rhetoric in response to North Korea's recent missile tests, but the new president's options appear limited in dealing with a challenge that has vexed his Oval Office predecessors. Most options fall into four categories: economic sanctions, covert action, diplomatic negotiations and military force. ECONOMIC SANCTIONS North Korea is already among the most heavily sanctioned nations, facing numerous strictures to limit its ability to conduct commerce, participate in international finance and trade in weapons and other contraband. Despite those measures, "most analysts agree that U.S. and multilateral sanctions have not prevented North Kor
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