U.S. President Barack Obama on Friday welcomed the agreements reached at the Non-Proliferation Treaty (NPT) Review Conference to strengthen the global non- proliferation regime and reiterated support for establishing a Middle East zone free of weapons of mass destruction. 'The United States has long supported such a zone, although our view is that a comprehensive and durable peace in the region and full compliance by all regional states with their arms control and nonproliferation obligations are essential precursors for its establishment,' Obama said in a statement. The month-long NPT Review Conference concluded on Friday with a final document in which 189 member nations agree on measures toward disarmament and the establishment of a nuclear weapon-free zone in the Middle East. 