President Vladimir Putin said Thursday in Moscow that a direct attack on Kaliningrad would put every Russian weapon on the agenda at once. He told the Valdai forum the question would arise "inevitably and immediately," and he added, "This is inevitable." He named Kaliningrad first, then "perhaps other territories as well."

A Russian note that NATO said it received this week used direct nuclear language. Reuters saw the text, which said Russia would be ready to use its entire arsenal, "including nuclear weapons," if NATO tried to isolate Kaliningrad, and which warned of strikes on decision-making centers from the outset. The Associated Press reported that Putin called the warning correctly written, but that his forum answer did not specify nuclear weapons.

NATO spokesperson Allison Hart confirmed the message on Wednesday. She denounced "any irresponsible nuclear rhetoric" and said no NATO activity or exercise poses a risk to any part of Russia. Secretary General Mark Rutte called the threats "absolutely not called for and not helpful" and said a nuclear strike on the Baltic states is not a real risk, because Putin "can never win (against) NATO."

Kaliningrad is Russian land on the Baltic Sea that sits between NATO members Poland and Lithuania and does not border the rest of Russia. Reuters called it heavily militarized and slightly bigger than Connecticut. The Associated Press reported Russia's main Baltic navy base there, with nuclear-capable Iskander missiles deployed.

The Associated Press described the Suwalki Gap as an 80-kilometer stretch of the Polish-Lithuanian border between Kaliningrad and Belarus. The BBC said Western officials have long feared Russia would use that strip if it tried to seize Lithuanian territory. Lithuania's prime minister told the BBC last week that the country has evacuation plans, and thousands of NATO troops are stationed there.

Putin said Russia has no plan to attack a European country and would face "an enemy (NATO) twice our size," Reuters reported. The BBC quoted him saying Russia does not intend to attack anyone in 2029, 2030, or 2050, but will respond to aggression. Russian embassies said they had information that NATO is preparing an air and naval blockade of Kaliningrad, and NATO did not confirm that claim.

On August 18 a NATO flight over northern Poland and the Baltic included an American radar-jamming plane, the Associated Press reported. Fox News titled a Friday America Reports clip as a nuclear warning "over Ukraine weapons." Reuters, the BBC, NBC, and the New York Post tie the nuclear wording to isolating or attacking Kaliningrad.

Reuters quoted Maria Zakharova saying that if Europe attacks Russia, "it will be a completely different sort of war." Former diplomat Nikolai Sokov told Reuters he sees a risk of mutual miscalculation.