North Korean leader Kim Jong-un toured a powdered potato factory in Ryanggang Province near the border with China on Wednesday, well away from the state-of-the-art U.S. fighter jets that are buzzing his southern border.

North Korean leader Kim Jong-un visits a powdered potato factory in this grab from the [North] Korean Central News Agency on Wednesday. /Yonhap

Normally Kim stays out of sight during massive U.S.-South Korea military drills, preferably cooped up in a bunker.

One source said, "Ryanggang Province and neighboring Chagang Province have escape routes to China as well as deep tunnels dug under mountains that can provide refuge in case of a surprise bombing."

A B-1B Lancer strategic bomber, two F-35A and two F-35B stealth jets of the U.S., and two South Korean F-16K and two F-15K fighters fly in formation on Wednesday, in this photo provided by the Air Force. /Yonhap

The U.S. deployed B-1B Lancer strategic bombers to take part in the drill. The Joint Chiefs of Staff here said Wednesday that South Korean F-15K and F-16 fighter jets took part together with U.S. stealth fighters as well as a B-1B bomber that flew in from Anderson Air Force Base in Guam.

The exercises involving 230 aircraft end Friday.

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