The phrase "a permanent mission" is correct and usable in written English.
It can be used to refer to a long-term or ongoing assignment, often in a diplomatic or organizational context.
Example: "The country established a permanent mission to the United Nations to ensure its interests were represented consistently."
Alternatives: "a lasting assignment" or "a continuous mission".
He seems a man on a permanent mission to conquer new turf.
JMW Turner may be the most familiar of all British artists, but his allure remains so great that curators are on a permanent mission to find new angles from which to view him.
Havana also has a Permanent Mission to the United Nations in New York.
For economic reasons, it is the only UN member state which does not maintain a permanent mission in New York.
However, the document was drafted at the UN's Commission on Narcotic Drugs in Vienna, where no Caribbean nation has a permanent mission.
Although details of the discussions were not made public, the first indication of Soviet strategy in Vietnam came on 24 December 1964, when the Soviet government invited the North Vietnamese-backed National Liberation Front to open a permanent mission in Moscow.
"It's not meant to be a long-term permanent mission," Kirby said.
In a formal response to a U.N. inquiry, Syria's permanent mission to the U.N. wrote a letter citing Syria's constitution and domestic laws as evidence that allegations of arbitrary detention and torture are "no longer plausible".
The Group has submitted a request to the Permanent Mission of the Sudan for further clarification.
They included an adviser to the Permanent Mission of Turkey to the United Nations, based in New York, a staffer at the Turkish embassy staff in Riga, Latvia, and another official based in Turkey.
"It is mind-boggling why they could not use the name of an American functionary," Mr. Khan said during a news conference in Islamabad, according to a transcript provided by the Permanent Mission of Pakistan to the United Nations.
