REPUBLIKA.CO.ID, PAJU - North Korea on Wednesday barred South Korean workers from entering a jointly run factory park just over the heavily armed border in the North in the latest sign that Pyongyang's warlike stance toward South Korea and the United States is moving from words to action.

The Kaesong move came a day after the North announced it would restart its long-shuttered plutonium reactor and a uranium enrichment plant. Both could produce fuel for nuclear weapons that Pyongyang is developing and has threatened to hurl at the US but which experts don't think it will be able to accomplish for years.

The North's rising rhetoric over recent weeks has been met by a display of US military strength, including flights of nuclear-capable bombers and stealth jets at the annual South Korean-US military drills that the allies call routine but that North Korea claims are invasion preparations.

The Kaesong industrial park started producing goods in 2004 and has been an unusual point of cooperation in an otherwise hostile relationship between the Koreas, whose three-year war ended in 1953 with an armistice. Its continued operation even through past episodes of high tension has reassured foreign multinationals that another Korean War is unlikely and their investments in prosperous dynamic South Korea are safe.

"The Kaesong factory park has been the last stronghold of detente between the Koreas," said Hong Soon-jik, a North Korea researcher at the Seoul-based Hyundai Research Institute.

It is unclear how long North Korea will prevent South Koreans from entering the industrial park, which is located in the North Korean border city of Kaesong and provides jobs for more than 50,000 North Koreans. 

Pyongyang threatened last week to shut down the park, which is run with North Korean labor and South Korean know-how. It expressed anger over South Korean media reports that said North Korea hadn't yet shut the park because it is a source of crucial hard currency for the impoverished country.

About 120 South Korean companies operate factories in Kaesong which produced 470 million USD of goods such as clocks, clothing and shoes last year that are trucked back to the South for export to other countries. The industrial park is crucial for the small businesses that operate there to take advantage of North Korea's low wages but not important for the South Korean economy overall.

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