(SEOUL) — North Korean leader Kim Jong Un reopened a key cross-border communication channel with South Korea for the first time in nearly two years Wednesday as the rivals explored the possibility of sitting down and talking after months of acrimony and fears of war. Even among the sudden signs of easing animosity, however, President Donald Trump threatened Kim with nuclear war. In his New Year’s address Monday, Kim said he was willing to send a delegation to next month’s Winter Olympics in South Korea.