North Korean leader Kim Jong Un is “probably doing well,” U.S. National Security Adviser Robert O’Brien said on Tuesday.

The comments come after Kim’s recent unexplained, three-week disappearance from the public eye sparked worldwide speculation and rumors that he may be severely ill or even dead.

The DPRK leader ultimately reappeared at a fertilizer factory on May 1, according to North Korean state media, with some signs that he may have undergone a medical procedure — but he has not made another public appearance since then.

Speaking to reporters on Tuesday, O’Brien said he assumed — but would not confirm