TOKYO — U.S. Secretary of State Rex Tillerson called on North Korea on Thursday to abandon its nuclear and ballistic missile programs, saying the isolated nation “need not fear” the United States.

Tillerson made that declaration after meeting Japanese Foreign Minister Fumio Kishida in Tokyo, where they discussed possible new approaches in dealing with Pyongyang.

He said 20 years of U.S. diplomatic and other efforts to get North Korea to denuclearize have failed, but gave no specifics about how the Trump administration, which is currently doing a policy review, would tackle the issue. Tillerson described the weapons programs as “dangerous and unlawful.”

The former Exxon Mobil CEO is making his first trip to Asia as the top U.S. diplomat. Tensions are running high on the divided Korean Peninsula, and North Korea last week launched four missiles into seas off Japan and where the U.S. is currently conducting annual military drills with South Korea. Pyongyang views this as a rehearsal for invasion.

“North Korea and its people need not fear the United States or their neighbors in the region who seek only to live in peace with North Korea,” the secretary of state told a news conference in Tokyo. “With this in mind, the United States calls on North Korea to abandon its nuclear and ballistic missile programs and refrain from any further provocation.”

He later met separately with Japanese Prime Minister Shinzo Abe.