A North Korean official on Saturday said that the U.S. and South Korea are dreaming if they think that U.S. President Donald Trump’s sending a birthday message would get leader Kim Jong Un back to the negotiating table.

In a statement released by North Korea’s official Korean Central News Agency, Choe expressed optimism over the outcome of the meeting but did not say where it would take place.

Moon Jae-in said Trump and Kim would “face the stern judgment of the international community” if their promises on denuclearization weren’t kept.