Estonia's prime minister, Kristen Michal, has a blunt message for the rest of the European Union. Paying to deter Russia today is far cheaper than the price of failing to do so. As the bloc argues over how much to devote to defense, the leader of one of its most exposed frontline states is making the case that hesitation is the expensive choice, and that the bill for a Russia left unchecked would overwhelm any military budget the continent might balk at now.

Estonia's own spending lends weight to the argument. Tallinn is pushing its defense outlay toward 5 percent of national income, up from the 3.7 percent it had planned for 2026, and has approved a four year program worth roughly 2.8 billion euros, about 3.2 billion dollars, that lifts the average toward 5.4 percent of output through 2029. Estonia and neighboring Lithuania are the only members on track to clear the alliance's 5 percent benchmark well before the target date a decade from now, a pace that puts the small Baltic state at the front of Europe's rearmament.

Michal's warning rests on production as much as on budgets. He points out that Russia, despite an economy no larger than Italy's, can still outproduce Europe militarily, turning out artillery shells and drones faster than the continent's far bigger economy manages. That gap, in his telling, is the real weakness. The thinking on defense has shifted from a tripwire posture, which assumed lost ground could be retaken later, toward what planners call deterrence by denial, an approach meant to stop an incursion at the border. It is a strategy that demands stockpiles, air defense, and hardened infrastructure, and all of it costs money before any shot is fired.

The politics are as pointed as the economics. Michal casts Vladimir Putin as a leader who needs war to hold on to power, and reads Russian provocations along the union's eastern edge as attempts to pull European attention away from Ukraine. His pitch to the wealthier capitals to the west is that the frontline countries have already made the hard choices, and that the rest of the bloc can no longer treat defense as optional. For a nation that has lived beside Russia for centuries, the arithmetic is simple enough. The cost of deterrence is high, but the cost of being caught undefended would be higher still.