Wouldn’t this invoke NATO against the UK and demand a lot of reparations?
I assume you mean Article 5, and no, yes, maybe, but probably no.
Article 5’s requirement is that the members convene to discuss a response to an attack, not an obligation to attack.
Furthermore, this sounds more like an even dumber dumb Watergate, but with arguably, a moral justification i.e. covert burglary, maybe even armed robbery, for vaccines contracted to the UK.
Article 42.7 of the EU Charta would also apply and is a bit more direct:
If a Member State is the victim of armed aggression on its territory, the other Member States shall have towards it an obligation of aid and assistance by all the means in their power
It is not armed robbery when the military is sent to another country. war is ultimately always about ressources, so you could argue every war to just be an armed robbery gone wrong.
If someone sends their military to another coubtry without this countries explicit consent it is an act of war.
