North Korea Tensions Spike at Asian Security Forum

HANOI, Vietnam — North Korea on Friday threatened the United States and South Korea with a "physical response" to planned weekend naval exercises as tensions with the communist nation rose in the aftermath of the sinking of a South Korean warship blamed on the North.

In Vietnam for a Southeast Asian regional security forum, U.S. Secretary of State Hillary Rodham Clinton and a North Korean official traded barbs over the ship incident, the upcoming military drills and the imposition of new U.S. sanctions against the North.

The spokesman for the North Korean delegation to the talks, Ri Tong Il, repeated Pyongyang's denial of responsibility for the March sinking of the ship that killed 46 South Korean sailors and said the upcoming military drills were a violation of its sovereignty that harkened back to the days of 19th-century "gunboat diplomacy."

The exercises will be "another expression of hostile policy against" North Korea. "There will be physical response against the threat imposed by the United States militarily," Ri told reporters in Hanoi.

Clinton responded by saying the U.S. is willing to meet and negotiate with the North, but that this type of threat only heightens tensions. She added that progress in the short term seems unlikely, given the circumstances.

"It is distressing when North Korea continues its threats and causes so much anxiety among its neighbors and the larger region," she told reporters. "But we will demonstrate once again with our military exercises ... that the United States stands in firm support of the defense of South Korea and we will continue to do so."

Shortly before Ri spoke, Clinton had lashed out against belligerent acts by the North, warning that it must reverse a "campaign of provocative, dangerous behavior" if it wants improved relations with its neighbors and the United States.

She said stability in the region, particularly on the Korean peninsula, depends in large part on convincing an "isolated and belligerent" North Korea to alter course and return to nuclear disarmament talks.

Peaceful resolution of the issues on the Korean peninsula will be possible only if North Korea fundamentally changes its behavior, Clinton told the gathering of top officials from the 10 members of the Association of Southeast Asian Nations and countries with major interests in the area like the U.S., China, Japan, North and South Korea and Russia.

There was no sign that members of the U.S. and North Korean delegations would meet or even cross paths at the annual security forum, which has in the past been a venue for rare talks between the two sides.

On Wednesday, Clinton announced in the South Korean capital that the U.S. would slap new sanctions on the North to stifle its nuclear ambitions and punish it for the sinking of the South Korean ship. The penalties will target the country's elite by taking aim at illicit activities, such as counterfeiting cigarettes and cash and money laundering.

On Friday, Hungarian Foreign Minister Janos Martonyi, representing the European Union, said the bloc will also consider imposing new sanctions on the North.

Clinton was in Seoul to show support for South Korea along with U.S. Defense Secretary Robert Gates.

In addition to North Korea's behavior and its nuclear program, Clinton raised concerns about potential atomic collaboration between the North and Myanmar, also known as Burma, which is restricted by U.N. agreements.

Numerous reports in past months have suggested that Myanmar's military rulers are attempting to develop nuclear weapons with North Korean help.

Clinton said "recent events" had called into question Myanmar's pledges to abide by its international commitments, including U.N. sanctions, the requirements of its nuclear watchdog, the International Atomic Energy Agency, and the Nuclear Non-Proliferation Treaty. She did not elaborate but on Thursday mentioned in passing that a North Korean ship carrying military equipment had recently docked in Myanmar.

"It is critical that Burma hear from you, its neighbors, about the need to comply with" those obligation, Clinton told the forum.