North Korean leader Kim Jong Un boasted in an annual New Year’s Day speech Monday that he had a nuclear button on his desk and that the entire United States was within range of his weapons — but he also vowed not to attack unless threatened.

Kim promised to focus this year on producing nuclear warheads and missiles for operational deployment. But he also struck a conciliatory note, opening the door to dialogue with South Korea and saying he would consider sending a delegation to the Winter Olympics to be held in his southern neighbor in February.

“The United States can never fight a war against me and our state,” he said in the nationally televised speech. “It should properly know that the whole territory of the U.S. is within the range of our nuclear strike and a nuclear button is always on the desk of my office, and this is just a reality, not a threat.”

But Kim also said that North Korea was a peace-loving and responsible nuclear power, and would not use its nuclear weapons unless “hostile aggression forces” encroach on its sovereignty or interests.

“This year, we should focus on mass-producing nuclear warheads and ballistic missiles for operational deployment,” Kim said. “These weapons will be used only if our security is threatened.”