On Sunday, a solemn Kim Jong Un joined the memorial service at the Pyongyang Indoor Stadium on the eve of the anniversary of Kim Jong Il’s death.

Kim, whose entrances and exits usually are accompanied by a triumphant welcome song and a swell of cheers, entered the stage in silence, followed by top Workers’ Party, government and Korean People’s Army officials, as well as his aunt and uncle.

Tight security surrounded the gymnasium near Pyongyang’s Pothong Gate. Armed soldiers in helmets posted along the street outside diverted traffic and pedestrians while more guarded every entrance to the building. The handful of foreign journalists allowed to cover the event, including The Associated Press, were searched by armed soldiers.

In his speech, Kim Yong Nam called Kim Jong Il a ‘‘peerless patriot’’ who strengthened the military and stood up to the United States.

The U.S. and North Korea signed a truce, not a peace treaty, at the close of the 1950-53 Korean War, and Pyongyang cites American troops in South Korea as a key reason for building its atomic weapons program.

As the hourlong ceremony came to a close, the band briefly played the mournful refrain to ‘‘The General Will Always be With Us.’’ After the musicians put down their instruments, Kim Jong Un stood up and led a silent procession out.

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