SEOUL | The Obama administration moved Wednesday to push new sanctions against North Korea over its nuclear weapons program, as Secretary of State Hillary Rodham Clinton and Defense Secretary Robert M. Gates showed solidarity with South Korea during a visit to the area that separates it from the North.
Mrs. Clinton announced the measures — targeting the sale or purchase of arms and related goods used to fund the communist regime’s nuclear activities, and the acquisition of luxury items to reward its elite — after she and Mr. Gates toured the heavily fortified border in a symbolic trip four months after the sinking of a South Korean warship blamed on the North.
The penalties are intended to further isolate the already hermetic North and persuade its leaders to return to talks aimed at getting it to abandon atomic weapons. The U.S. also is trying to forestall more provocative acts like the torpedoing of the Cheonan, which killed 46 South Korean sailors.
With specifics of the sanctions still being worked out, U.S. resolve was demonstrated more strikingly when Mrs. Clinton and Mr. Gates — in a first for the top two U.S. Cabinet members — together toured the demilitarized zone in the village of Panmunjom.
Under sporadic downpours and the watchful gaze of curious North Korean guards, they paid tribute to the U.S., South Korean and international forces that patrol the world’s last Cold War-era border. Sixty years after the fighting began, the peninsula remains divided in a state of war because the conflict ended in a truce, not a peace treaty.
At one point, in the Military Armistice Commission building where officials from North Korea and the U.N. Command meet for talks, Mrs. Clinton and Mr. Gates stood briefly on North Korean soil while a North Korean solider peered at them through a window.
“In fact, our military alliance has never been stronger and should deter any potential aggressor,” he said.
In response to the Cheonan sinking, the U.S. and South Korea have announced plans to conduct more military exercises in the coming weeks, sparking threats from North Korea and expressions of concern from its lone major ally, China.
“Although it may be a thin line, these two places are worlds apart,” Mrs. Clinton said in reference to the three-mile-deep buffer zone that stretches from east to west and lies just 30 miles from the South Korean capital. She urged North Korea to turn away from the isolation that has left its people suffering.
“We continue to send a message to the North: There is another way. There is a way that can benefit the people of the North,” she said. “But until they change direction, the United States stands firmly on behalf of the people and government of the Republic of Korea, where we provide a stalwart defense along with our allies and partners.”
Presenting the outlines of the fresh sanctions, Mrs. Clinton said the North could win “the security and international respect it seeks” by stopping its provocative behavior, halting threats toward its neighbors and returning to denuclearization talks.