South Korea’s top nuclear envoy says the government is more focused on what countermeasures it will take after North Korea launches a missile than on devising ways to preemptively stop a launch.

Before departing for China, Wi Sung-lak told reporters that post-launch measures include sanctions imposed by the U.N. Security Council and concerned countries.

He said five members of the six-way talks agree that a missile launch by Pyongyang is not helpful for the stability of the Northeast Asian region.

While in Beijing, Wi will discuss the North Korean missile problem with China’s chief nuclear negotiator Wu Dawei.

On Wednesday, he will fly to Washington to meet with U.S. special envoy on North Korea Stephen Bosworth to discuss what measures will be taken if the North launches a long-range missile.