N. Korean 'Provocations' Prompt Obama Call to Toughen Sanctions

President Barack Obama says the United States will work with allies to toughen sanctions on North Korea after the regime's latest ballistic missile launches Monday.

"We are going to work diligently together with the most recent U.N. sanctions," Obama told reporters after meeting with South Korean President Park Geun-hye. "We are going to work together to make sure we're closing loopholes and make them even more effective."

Both leaders suggested they would continue to push China, North Korea's only ally in the region, to use its influence to intervene.

Obama says the launches were "provocations," but he also says there is room for dialogue if North Korea changes direction.

"If it is willing to recognize its international obligations and enforce the denuclearization of the Korean Peninsula, the opportunities for us to dialogue with them are there," Obama said. "We do not have any interest in an offensive approach to North Korea."

Meanwhile, North Korea just released video allegedly showing their missile test. The three large rockets are lined up together before taking off in sequence with three fiery blasts.

South Korean and Japanese officials say the missiles traveled about 600 miles before landing in the Sea of Japan.

Just last month, the U.N. Security Council strongly condemned four other North Korean ballistic missile launches in July and August. It called them "grave violations" of a ban on all ballistic missile activity.