Yes. On September 30, 2026, Reuters reported that Russia warned NATO in a diplomatic “non-paper” that it would be ready to use its full arsenal, including nuclear weapons, if alliance countries tried to isolate Kaliningrad, Russia’s Baltic exclave between Poland and Lithuania.
NATO spokesperson Allison Hart confirmed the alliance received the document and replied that NATO is defensive and that its activities pose no risk to any part of Russia, while denouncing “irresponsible nuclear rhetoric.” Source: MarketScreener (Reuters).