Myanmar's ambassador to the United Nations in New York has formally staked his claim as the country's legitimate representative while the junta seeks to replace him in a dispute that will likely have to be settled by the world body's 193 member states.

Myanmar state television announced on Saturday that Kyaw Moe Tun had been fired for betraying the country, a day after he urged countries to use "any means necessary" to reverse a Feb. 1 coup that ousted the nation's elected leader Aung San Suu Kyi.

But in letters to the U.N. General Assembly President Volkan Bozkir and U.S. Secretary of State Antony Blinken — seen by Reuters on Tuesday — Kyaw Moe Tun said he remains Myanmar's U.N. ambassador.