The delegates must be vaccinated to enter the debate room, the mayor’s office told the presidency in a letter dated 9 September.
They must also be vaccinated if they want to eat or exercise indoors, the letter added.
New York began enforcing a vaccine mandate on Monday, requiring evidence of at least one shot for many indoor activities, including restaurants and entertainment venues.
The letter, signed by the New York Health Commissioner and confirmed by his spokesman, stated that the UN debate hall was classified as a “congress center”, which means that all participants must be vaccinated.
“They must also show proof of vaccination before eating, drinking or exercising indoors on the UN campus and in order to participate in all the wonderful entertainment, restaurant and fitness activities in New York,” he said.
Russia’s ambassador requested an urgent Thursday meeting of the General Assembly to discuss the move.
Vassily Nebenzia wrote to parish president Abdulla Shahid on Wednesday, saying he had been “very surprised and disappointed” by a letter Shahid wrote to members in support of the demand for proof of vaccination.
“We strongly object that only people with proof of vaccination should be admitted to the GA hall,” Nebenzia wrote in the letter that AFP saw.
He described it as “a clearly discriminatory measure” and added that preventing delegates from gaining access to the hall was a “clear violation of the UN Charter”.
The letter also reminded diplomats that the state of New York requires everyone to wear masks on public transportation.
“New York City strongly encourages universal mask use indoors regardless of vaccination status,” the note added.
The 76th session of the General Assembly starts on Tuesday and ends the following Monday.
It will be a combined personal and distant event after last year’s version took place practically due to the pandemic.
New York accepts all vaccines that have been approved by either the World Health Organization or the US Federal Food and Drug Administration.