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.

China and Japan have agreed to set up talks on often contentious security issues. The two countries are seeking to improve a relationship riven in recent years by a range of issues, from territorial disputes to the discharge of water from Japan’s tsunami-wrecked nuclear power plant.

Japanese Foreign Minister Takeshi Iwaya has met with top Chinese leaders during his visit to Beijing, the first since the heads of the two countries met at a summit in Peru last month

Japanese foreign minister Takeshi Iwaya was due in Beijing on Wednesday for talks with counterpart Wang Yi and other top officials as Tokyo acknowledged "challenges and concerns" in ties.

Takeshi Iwaya made his first trip to Beijing since becoming Japan's foreign minister in October. Chinese officials said often difficult bilateral ties were "at a critical period of improvement and development.