> Isn't the logical action for EU to launch massive pre-emptive strikes

To be clear, strikes wouldn't be "pre-emptive", Russia is already in a war, and it's entirely allowed for any nation to join the side of Ukraine. None of the rules of war prevent helping a friendly country by joining the fight.

"Europe thinks the unthinkable: Retaliating against Russia" - https://www.politico.eu/article/europe-thinks-the-unthinkabl...