Donald Trump’s executive actions are clearly weakening the international standing of the United States and begging the question of U.S. relevance in terms of its political, diplomatic, and even economic standing.  A strong case can be made that the U.S. role in international diplomacy is already weakening.  The United States is no longer a major factor in  the diplomacy of arms control and disarmament.  In fact, the U.S. emphasis on a national missile defense (the so-called Golden Dome) will worsen the strategic environment, and encourage many others to enhance their strategic offensive arsenals to overwhelm a Golden Dome or simply pursue their own nuclear weapons.