There's a saying if you want peace prepare for war. Especially with Russia who seem to have a habit of cooperation with countries that can defend themselves and invasion of those who can't.
Sure, EU combined already spends three times as much as Russia in "showing strength". I'm sure there must be a way to use what we have without tripling the expense. If nothing, because if we need 10 times their military expense to keep up with them we'd only show that we are in fact weaker.