Speaking to reporters in Kyoto, Ishiba said there has been progress in negotiations, pointing to discussions on trade expansion, non-tariff measures, and economic security.

Ishiba held a 45-minute phone call on Friday with President Donald Trump to discuss security, diplomacy, and tariffs. He said they hoped to meet in person at the G7 summit.

On Sunday, Ishiba expressed Japan's willingness to cooperate in shipbuilding. He said the US has shown interest in the possibility of repairing US warships in Japan and that Japan might cooperate in exchange for concessions in tariff negotiations.