As much as I would like it to be different, we are still at least one or two decades away from an effective European deterrent against Russian aggression. If only because of our inability to coordinate decisive responses and our unwillingness to pool military resources in a European army, rather than split them into national militaries with incredibly amounts of redundancy and ineffectiveness.
Yes, but these hurdles to overcome are political, not technological or financial. And for that period, the biggest deterrent against Russia is Russia itself, because they are militarily, as a former german Chancellor once said "The Republic of Upper Volta with nuclear Warheads"
As much as I would like it to be different, we are still at least one or two decades away from an effective European deterrent against Russian aggression. If only because of our inability to coordinate decisive responses and our unwillingness to pool military resources in a European army, rather than split them into national militaries with incredibly amounts of redundancy and ineffectiveness.