The Trump administration’s envoy in long-stalled talks with North Korea spoke on the phone with his South Korean counterpart on Wednesday, the U.S. State Department confirmed to NK News.

The call — between Stephen Biegun, the U.S. envoy, and Lee Do-hoon, the South Korean envoy — was first reported by South Korea’s Yonhap News Agency, citing an unnamed South Korean official.

According to Yonhap, the call took place to discuss North Korean leader Kim Jong Un’s announcement on January 1 that his country may be reconsidering its self-imposed moratorium on nuclear weapons tests, despite the onslaught of punishing sanctions