North Korean leader Kim Jong-un has praised South Korea for its “impressive” efforts in hosting the North at the Winter Olympics. It comes came after the North’s official delegation, led by Kim’s sister Kim Yo-jong, returned home from their landmark visit to Pyeongchang. Kim had thanked the South for “prioritizing” their visit to the Games. North Korea’s attendance has been seen as a significant warming in relations. But there have also been concerns that it has allowed North Korea to win a propaganda victory.