Invested with full power. (Merriam – Webster)
A plenipotentiary is a person who has full power to make decisions or take action on behalf of their government, especially in a foreign country. (Collins Dictionary)
A person who has the authority to represent his or her country, especially in another country. (Cambridge Dictionary)
A person, especially a diplomat, invested with the full power of independent action on behalf of their government, typically in a foreign country. (Oxford Dictionaries)
Kodokan received a visit by the Ambassador Extraordinary and Plenipotentiary of the Kyrgyz Republic in Japan.