TOKYO (AP) — Closing two days of around the clock negotiations, U.S. officials said Friday that they reached a breakthrough with Japan to move forward a stalled regional trade pact even though gaps remain that could still upend a final agreement.

Japanese officials were more restrained in assessing the status of the Trans-Pacific Partnership talks. Chief negotiator Akira Amari said, “There was progress of course, but it’s not something like a basic agreement.”