[Melatonic]

I doubt this really - I think it is much more likely that in the past few months specops from other countries were in Ukraine training the hell out of Ukrainian soldiers. I guess I would not be surprised if individual countries that bordered Russia / Ukraine had limited people in the area but the potential political fallout would be huge if the UK for example was caught operating in the country while publicly saying they are not.

Private for hire mercenary groups though who knows