North Korean leader Kim Jong Un said Thursday he is open to a summit meeting with South Korea, an unusual overture made amid his country's heightened tensions with the United States, Seoul's closest ally, over a damaging cyberattack on Sony Pictures Entertainment Inc.

"If South Korean authorities have a position that they seriously want to improve North-South relations through dialogue, we believe we can resume suspended high-level contacts and sectoral meetings," Kim said in a nationally televised New Year's address.

Depending on the "atmosphere and environment," he said, "there is no reason not to be able to hold the highest-level meeting" with South Korean President Park Geun Hye.