Obama Administrations Nuclear Policy and Its Effect on International Security and Nuclear NonProliferation Regime(Zhang Yeliang) Since Barack Obama assumed the presidency, he has made major changes to U.S. nuclear policy with a new approach. By initiating a nuclearfree world and signing a new strategic nuclear arms reduction treaty with Russia while maintaining a safe, reliable and effective U.S. strategic deterrent, Obama administration’ intends to achieve the goals of enhancing U.S. moral position in nuclear related issues, restoring U.S. global influence and leadership in the field of nuclear arms reduction and nonproliferation, resuming international efforts to promote nuclear non-proliferation, and strengthening U.S. security. The shift in Obama’s nuclear policy will profoundly affect U.S.-Russian strategic relations, global nuclear arms control and reduction, and international non-proliferation regime, but will also encounter great challenges.