By Liz Lee and Sakura Murakami BEIJING/TOKYO (Reuters) -Seafood trade is expected to be on the agenda on Wednesday as Japan's foreign minister visits China, Japan's largest export market for aquatic products until Beijing banned them in protest against Tokyo releasing treated radioactive wastewater into the ocean.

China and Japan agreed that Beijing’s top diplomat should visit in 2025, adding to the signs the two nations are repairing ties that have been strained in recent years.

Japanese foreign minister Takeshi Iwaya raised "serious concerns" on Wednesday over China's military buildup as he met counterpart Wang Yi in Beijing, Tokyo said.