Thanks to growing Nordic-Baltic cooperation, and their outsize contribution to Ukraine’s defense (the region accounts for eight of the top 11 contributors by share of GDP), a region that was NATO’s Achilles heel until this decade is now one of the alliance’s most well-prepared and capable. It is united by a shared threat perception and willingness to do what is needed.

Other European allies need to do the same. The opportunity to deter Russia is now, using the time that Ukraine has provided for the rest of Europe.