President Donald Trump is willing to meet with North Korean leader Kim Jong Un, he told his South Korean counterpart on Monday when they discussed peace in the Korean Peninsula and Pyongyang’s nuclear weapon capabilities.

Donald Trump suggested on social media that the U.S. might stop doing business with South Korea, but in a meeting with President Lee Jae Myung, no tension emerged.

A top South Korean official said on Monday that the U.S. and South Korea had decided to establish a non-binding agreement to define the operation and structure of $350 billion in investment funds agreed as part of a July trade deal.