Russia and Iran Undermining The UN In Ukraine War – Why Are Both Nations Still In The UN?

NATO are looking set soon to designate Russia officially a terrorist State in the world.

If they do so, the EU and US will follow similar – as will most of the East – but this article goes into Iran too:

https://www.iranintl.com/en/202211214018

How are Iran being allowed to get away with their now direct involvement in the war in Ukraine?

Actively saying recently they are going to produce new drones for Russia – Iran are having problems as a country anyway – how are Russia and Iran still in the UN at all?