Prime Minister Shinzo Abe and U.S. President Barack Obama held telephone talks Thursday, a Japanese government official said.
The two leaders were likely to "talk about the U.S.-China summit," Chief Cabinet Secretary Yoshihide Suga told a morning press conference without elaborating.
Japan is apparently hoping to learn details of the talks held over the weekend in California between Obama and Chinese President Xi Jinping, especially about Beijing's take on the Senkaku Islands, a group of islets administered by Japan but claimed by China.
At the bilateral summit, Obama was quoted as telling Xi that "the parties should seek to deescalate, not escalate" the dispute over the islands and "to have conversations about this through diplomatic channels and not through actions out of the East China Sea."
In response, Xi told Obama that China will resolutely protect the integrity of its sovereignty and territory.