Both North Korea and left-leaning supporters of South Korean President Moon Jae-in want him to restore economic ties broken by security tensions. But pleasing them would mean angering U.S. President Donald Trump.

On Tuesday, North Korea said it was closing down communication links set up two years ago between Moon and Kim Jong Un, jeopardizing the South Korean leader’s 2017 campaign promise to move the heavily armed rivals toward a permanent peace. It’s bad timing for Moon: His ruling bloc secured a historic supermajority in National Assembly elections in April, boosting calls within his Democratic Party to mend ties with North Korea.

The problem for Moon is that he doesn’t have much he can offer North Korea without prompting a blowup from the Trump administration, which has repeatedly rejected South Korea’s calls for sanctions relief. The U.S. has refused to relax United Nations penalties and other measures against the regime without greater commitments on arms reduction from Kim.