Russia has warned NATO it would be ready to resort to nuclear weapons if the Western alliance attempted to cut off Kaliningrad, a Russian exclave that borders the Baltic Sea, Reuters reports.
In a document sent to NATO and seen by Reuters, Moscow accused the alliance of a "dangerous and reckless course" that entailed "high risks of the outbreak of a direct armed conflict".
The document said this included the possibility of "Russian strikes against decision-making centers in the alliance's member states right from the outset".
"Russia will be ready to use the entire arsenal of forces and capabilities at its disposal, including nuclear weapons, in order to defend its territory should NATO countries undertake any attempt aimed at isolating the Kaliningrad Region from the rest of the country," the diplomatic note said.
The warning highlighted Moscow's urgent concern at what it has presented as a growing NATO threat to Kaliningrad, a heavily militarised Russian territory that is wedged between Poland and Lithuania and is slightly bigger than the US state of Connecticut.
NATO Secretary General Mark Rutte said the alliance had responded to Russia's message by declaring: "We are a defensive alliance. And stop the nuclear threats. This is absolutely not called for and not helpful."