NATO’s eastern flank braces for Russia’s war games


Zapad 2025 is a large-scale joint military exercise between Russia and Belarus taking place from September 12–16, 2025. It is the first Zapad war game since Moscow’s full-scale invasion of Ukraine in 2022, and it’s drawing intense attention from Western governments, defense analysts, and NATO officials.

Although Russian and Belarusian officials describe the drills as “defensive,” their scope and location are highly symbolic. Some maneuvers are being staged close to Poland and Lithuania, just a few dozen kilometers from NATO territory, including areas around the Suwałki Gap — widely seen as one of Europe’s most vulnerable defense corridors.

Officials in Lithuania and Poland have already issued statements stressing that they will “closely monitor” every move. NATO itself has said there is no immediate threat to alliance members but emphasized that it remains “vigilant” about the possibility of provocations.

What the West Will Be Watching

Zapad 2025 offers a rare real-time window into Russia’s military readiness three years into its costly war against Ukraine — a conflict that has inflicted heavy losses on personnel and equipment but has also pushed Moscow to ramp up its war economy. Western observers will be studying whether Russia can still coordinate large operations, how it integrates new technologies such as drones and precision missiles, and how effectively it works with Belarus under wartime conditions.

This year’s exercise is officially capped at 13,000 personnel, but European military officials believe the true number could be closer to 30,000 when separate Russian drills with Collective Security Treaty Organization (CSTO) partners are counted. The drills reportedly include practice with Oreshnik nuclear-capable missile systems, highlighting the nuclear dimension of Russian planning.

Rising Tension Along NATO’s Borders

Neighboring countries aren’t standing still. Poland is running Iron Defender-25 with 30,000 troops, Lithuania is holding its Thunder Strike national defense exercise, and 10 Northern European NATO members are conducting Tarassis 25 to test their own readiness. These simultaneous war games underscore how much Zapad 2025 has become a flashpoint for regional security.

Analysts caution that even “defensive” drills can create dangerous ambiguity. Drone incursions, airspace violations, cyberattacks, or sabotage of infrastructure — even if meant as tests — could be interpreted as real aggression. That risk is heightened when troops, weapons, and command systems are on high alert.

The Bottom Line

Zapad 2025 isn’t just another routine exercise. It’s a critical indicator of how far Russia’s military has recovered — or not — from the war in Ukraine, how it plans to fight future conflicts, and how NATO responds to potential provocations on its borders. For Western observers, the stakes go beyond numbers on paper: the exercise is a live stress test of Europe’s security architecture at a moment of high tension.

  

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