U.S. President Barack Obama on Wednesday warned that Iran and North Korea will face deeper isolation if they fail to bring their nuclear programs into compliance with international law. "There is a future of greater opportunity for the people of these nations if their governments meet their obligations. But if they continue down a path that is outside international law, they must be met with greater pressure and isolation," President Obama told world leaders at U.N. headquarters. President Obama said his administration had worked to strengthen treaties and institutions dedicated to limiting proliferation of nuclear weapons, and therefore needed to hold accountable any countries that flout such regimes. "The Iranian government cannot demonstrate that its program is peaceful, has not met its obligations, and rejected offers that would provide it with peaceful nuclear power," the U.S. President said. "North Korea has yet to take concrete steps toward abandoning its weapons, and continues belligerent actions against the south."