Boris Yeltsin's letter dated 24 December 1991 was deleted from the United Nations web site in January 2024. (It's back in April, after I asked about it)

Here it is, with the original UN explanatory note, and links.

Yeltsin’s letter is the evidence that the Russian Federation is not a member of the United Nations, and how it fraudulently started to participate illegally in the UN and the Security Council, instead of applying for membership under Article 4 of the United Nations Charter like every other ex soviet state did.

Here is the link to the last save of the page (24 January 2024) in archive.org.

Where can I find the letters of 24 December 1991 regarding the continuation of the membership of the USSR by the Russian Federation?

For all the documents, see