Sweden’s entry into NATO can help solve a critical problem for military planners mapping out the alliance’s defenses against a potential Russian attack: how to rapidly shuttle troops, weapons and other provisions to a front anywhere from the Baltic to the Arctic.

After months of delays, the green light for Sweden’s membership means the Nordic nation can finally be woven into the North Atlantic Treaty Organization’s intricate defense plans, which designate Russia as a primary threat.

The move is more pressing with Russian troops starting to advance in Ukraine again. With Russian President Vladimir Putin’s expansionist ambitions apparent, European officials have started warning about the prospect of an attack on NATO within the next few years.