So interesting to note that the UN service rules and CCS rules (or their state equivalents) in India place similar restrictions. While India was inspired by the British rules (post-Independence) and later the Soviets (with no real change thereafter despite the current "decolonisation" rhetoric), it is amazing that the UN remains hidebound to this day.
https://economictimes.indiatimes.com/news/international/world-news/china-accused-of-influencing-votes-at-un-to-serve-its-interests-whistleblower-claims/articleshow/109361897.cms