European Security — 2026-06-18

Germany and Poland Sign Bilateral Defense Cooperation Agreement Strengthening Eastern Flank

BLUFGerman soldiers will likely deploy to Poland's Eastern Shield within 12 months, pre-positioning both nations to sustain Eastern Flank defense independent of American force levels.

Germany and Poland signed a defense cooperation agreement in Warsaw on Wednesday, with Defense Ministers Pistorius and Kosiniak-Kamysz presiding, covering Baltic Sea protection, military mobility, cyber defense, and new technologies 12. The accord is inter-ministerial, focused on practical cooperation and lacking the mutual defense declarations each country has separately concluded with France and the United Kingdom; Foreign Minister Sikorski told Polish Radio Trojka that President Nawrocki would never consent to a fuller bilateral treaty 23. Deputy Defense Minister Tomczyk told AP that German soldiers will contribute to Poland's Eastern Shield fortifications along its borders with Belarus and Russia 2. After a June 7 London meeting on Ukraine that excluded Poland, Prime Minister Tusk told a Warsaw press conference that arrangements reached without Warsaw's participation "will not be respected or binding for us" 12.

Analysis
The Warsaw agreement converts Poland's demand for inclusion into a concrete NATO burden-sharing mechanism, linking practical security cooperation to Warsaw's insistence on a seat in Ukraine peace diplomacy. German military personnel are likely to deploy to Poland's Eastern Shield within 12 months of the signing. We have high confidence in this assessment. Both governments have publicly committed to the arrangement, Eastern Shield construction is active, and NATO's Baltic defense plans create structural incentive for follow-through. The bilateral agreement pre-positions Germany and Poland to absorb a partial US withdrawal by establishing independent Eastern Flank cooperation that does not depend on American force levels, connecting directly to Hegseth's six-month posture review. The agreement's inter-ministerial ceiling reflects a deliberate choice: Nawrocki's veto threat and the reparations issue will sharpen ahead of Poland's 2027 general election, closing any path to treaty elevation in the near term.

3 sources

Germany and Poland sign pivotal deal for Europes defence - European Interest
Germany and Poland to sign a new defense deal as balance of power in Europe shifts - ABC News (AP)
Poland and Germany Sign Bilateral Defence Agreement - U.S. News & World Report