special envoy; special emissary
Refers to a person sent on a specific diplomatic or official mission, often with temporary authority.
政府は和平交渉のために特使を派遣した。
The government dispatched a special envoy for peace negotiations.
The prime minister appointed the former minister as a special envoy.
The government dispatched a special envoy for the peace negotiations.
He visited North Korea as a special envoy.