I would argue that the UN was about restoration of status quo ante and Big Power politics (hence the Permanent 5 Veto).
Which is the restoration of the duly elected President of Ukraine until such time as another election is held.
The advocacy of lets give into Mod rule because we like the result means that if a Million Spanish gathering regarding Unemployment in Madrid and storm Govt buildings and demand a new govt then we should recognise.
Once you give into Mob rule then what next ?
Russia has done nothing wrong in relation to Ukraine, it is allowed move its military equipment around, move personnel in and out of the country.
The claim that some group of people armed or otherwise have gone to the airport or other places is actually not much different that a thousand people gathering in middle of Kiev.