The only country on this planet that is currently capable is SEAD is the USA. No single or combined European power/s can put together a strike package that can significantly degrade an enemies air defenses. I don’t think China has the capacity yet and Russia obviously doesn’t have it.

I don’t expect Ukraine even with Western hand me down Vipers to take down Russian air defenses. They may be able to contest for air superiority over a sector of the battlefield but it would be costly.

Stealth is a huge component of modern Western air warfare doctrine that allows fighters to operate in contested airspace. But stealth isn’t SEAD.

For everyone else, light mobile artillery, long range rockets, AA and drones are going to be the way forward.