The government plans to concurrently replace its ambassadors to the United States, China and South Korea in a move aimed at restructuring diplomatic ties amid a series of tough negotiations and territorial disputes, sources said Monday.

Vice Foreign Minister Kenichiro Sasae will replace Ichiro Fujisaki as ambassador to the United States, while Deputy Foreign Minister Shinichi Nishimiya will get the China portfolio and colleague Koro Bessho will be appointed envoy to South Korea, the sources said.

The appointments are expected to be finalized after the regular Diet session ends Sept. 8, they said.