President Barack Obama peered across South Korea’s tense border with the North on Sunday in a show of solidarity with U.S. ally Seoul and a message of resolve to Pyongyang’s new young ruler in his country’s nuclear standoff with the West.

Arriving on the eve of a global summit on nuclear security hosted by South Korea, Obama flew by helicopter to a U.S. base on the edge of the Demilitarized Zone (DMZ) as a solemn North Korea came to a halt to mark the 100th day after “dear leader” Kim Jong-il’s death.

“You guys are at freedom’s frontier,” Obama told about 50 troops crammed into the Camp Bonifas mess at one of the world’s most heavily fortified frontiers.

“The contrast between South Korea and North Korea could not be clearer, could not be starker, both in terms of freedom and in terms of prosperity.”

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