Russia warns NATO over Kaliningrad isolation, including nuclear threat

Russia transmitted a letter through its embassy in Belgium warning NATO that it could use its “entire arsenal,” including nuclear weapons, if NATO members attempted to isolate Kaliningrad from the rest of Russia. [2][3]

Moscow said NATO exercises in the Baltic region were simulating or preparing for scenarios involving Kaliningrad’s military and political isolation. That characterization is Russia’s claim, not an independently established description of the exercises. [2][3]

The Russian Embassy in Brussels later published a statement on X accusing NATO of intensifying military activity along Russia’s western borders and urging alliance members to avoid actions Moscow described as destabilizing or escalatory. [2][3]

The embassy’s commentary, dated 28 September 2026, also rejected Western assessments that Russia could attack a Baltic state by 2029 or earlier. That passage records Moscow’s position rather than establishing the underlying assessment. [3]