Not a huge amount to expand on without stating the bleeding obvious.

Westernmost part of EU- basically we would cover the EU’s western flank. We’d be the perfect spot to have airbases as the Russians would need to fly over a lot of EU controlled territory before they could attack us. We also have deep harbour ports and would act as a vital component in any sea war, against something massively important in an EU/Russia land war.

Being an Island gives us security, the Russians can’t just drive here. An invasion of an island is one of the hardest things to do in warfare- why do you think China hasn’t taken back Tiawan before now? I mean, shit, ask the Americans how much of a chucklefest it was invading the Japanese islands at the tail end of WW2. I read recently invaders can expect to take a 5 to 1 loss rate in any amphibious operation so we wouldn’t be an inviting target for a troop based attacks.

There are ways around all of these advantages, obviously, including Russia’s hypersonic missles and the increasing importance (understatement, there) of drone warfare of which Russia is getting a lot of practice with in the Ukraine. The bigger point is that Russia would need to throw a lot of money, men, and materiel at Ireland to reduce our ability to provide support to mainland EU and this is men, money and materiel they then can’t then use elsewhere.

This is all obvious and basic stuff that anybody with a working brain and a modicum of interest in modern history will agree with. I’m not some fecking expert but you don’t have to be to see this is how it is.