Farage tried to foment violence in the UK. Despite massive coverage & the presence of a dozen or more prominent far right activists, none from Southampton, the outcome was pathetic.
Turning to "loyalists" in NI was pushing at an open door, burning out foreigners rather than Catholics, no problem.
The US, an uncertain ally at best, is able to block the use of those any time it likes. Can anybody doubt that it would?
Ukraine has shown that the paradigm has shifted. The US pays for large, hugely expensive drones in the dozens whilst Ukraine spends less to greater effect in producing 000's.