NATO's Eastern Flank: Baltic States Complete Historic Defence Build-Up

Estonia, Latvia, and Lithuania complete major military infrastructure investments as Russia threatens continued aggression beyond Ukraine.

Fortress Baltic: How the Smallest NATO Members Are Leading Europe's Defence

The three Baltic states — Estonia, Latvia, and Lithuania — have completed a transformative military build-up that has fundamentally changed the security calculus on NATO's eastern flank. Having spent years warning European allies of the Russian threat before the 2022 invasion of Ukraine, the Baltic governments have invested a larger share of their GDP in defence than any other NATO members except Poland, and their military capabilities per capita now rank among the most formidable in the alliance.

Estonia, which already hosted NATO's Cooperative Cyber Defence Centre of Excellence, has expanded its defence spending to 3.2 percent of GDP and completed a major upgrade of its land defences including new anti-tank missile systems, mobile artillery units, and a network of pre-positioned equipment storage facilities. The Estonian Defence Forces have also become leaders in integrating AI-assisted surveillance systems along the country's 294-kilometre border with Russia, deploying sensor arrays and automated alerting systems that significantly extend the effective range of border monitoring.

Latvia and Lithuania have made comparable investments, with both countries completing agreements to host permanently stationed NATO battle groups that have been upgraded from battalion strength to brigade-level formations. The presence of German, British, Canadian, and US forces alongside native troops represents a genuine deterrent capability, and military exercises conducted in early 2026 tested the integration of NATO forces with national militaries under realistic combat scenarios.

The build-up has not been without economic cost. Military spending at these levels diverts resources from social services, infrastructure, and education, creating political tensions in countries where average incomes remain below the EU median. Governments have sought to manage this by framing defence investment as a job creation programme — the new defence industries, maintenance facilities, and military construction projects are significant employers in regions that have historically struggled with youth unemployment and emigration.