Russia has issued a blunt nuclear warning to NATO over Kaliningrad, threatening to unleash its full military arsenal if the alliance attempts to cut off the heavily armed Russian outpost from the rest of the country.
Moscow delivered the warning in a diplomatic document sent to NATO as tensions continue rising across the Baltic region.
The document warned that Russia could use “the entire arsenal of forces and capabilities at its disposal, including nuclear weapons” if NATO countries attempted to isolate Kaliningrad.
Kaliningrad sits on the Baltic Sea between NATO members Poland and Lithuania, separated geographically from mainland Russia but packed with military infrastructure and home to elements of Moscow’s Baltic Fleet.
Russia also raised the possibility of striking “decision-making centers” inside NATO member states from the opening stages of a wider conflict.
NATO rejected Moscow’s accusations and said the alliance remains defensive, arguing that its military exercises and deployments do not threaten Russian territory.
The alliance also called on Russia to halt what it described as “irresponsible nuclear rhetoric.”
The threat is the latest example of the Kremlin invoking its nuclear arsenal as NATO countries continue supporting Ukraine and strengthening defenses along Europe’s eastern flank.
Carrie Filipetti, executive director of the Vandenberg Coalition and a former State Department official, said the tactic is hardly new.
Russia’s Embassy in Ireland has issued an explicit nuclear warning to NATO, saying Moscow would be prepared to use its full arsenal, including nuclear weapons, if alliance members attempted to isolate Russia’s Kaliningrad region from the rest of the country.
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“Russia has threatened to use nuclear weapons in the past, including veiled references to tactical nuclear attacks at the beginning of [Putin’s invasion of Ukraine], lowering their formal threshold for launching a nuclear attack in 2024, placing Russia’s nuclear forces on high alert, and restarting nuclear testing,” Filipetti said. “It is very common for Putin to use these threats, because he sees it as a way to deter Europe and the United States from continuing to support Ukraine.”
She said the latest warning comes amid NATO air activity near Kaliningrad and escalating tensions over Russia’s war in Ukraine.
“The threat about a nuclear attack if Kaliningrad is threatened or isolated comes on the heels of a few developments,” she added.
Filipetti argued that Moscow is facing growing pressure as the war drags on.
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“Putin seems to understand that the tide is turning against him, and he’s resorting to aggressive rhetoric to try to stop European support for Ukraine as he has tried to do in the past,” she said.
Experts also warn that Kaliningrad has become much more than a military outpost.
Dr. Azeem Ibrahim of the Strategic Studies Institute at the U.S. Army War College said Russia has increasingly relied on hybrid warfare aimed at disrupting the infrastructure modern societies depend on.
“Russia is actually adopting a very different approach,” he said, describing a strategy of hybrid warfare targeting “infrastructure” and “societies in general — what keeps societies functioning.”
Ibrahim described Kaliningrad as a central hub in that effort.
“It’s essentially become a Russian fortress,” he said. “This is essentially a front-line operation of the Russians in terms of signals intelligence, signals interference and essentially mechanisms by which to carry out this hybrid warfare.”
Those operations can include interference with communications, power systems and other civilian infrastructure, creating disruption without crossing immediately into conventional warfare.
“All of that would be preceded by interference operations like this to ensure that societies are not functioning, are not able to respond to emergency services, the news information services, etc.,” Ibrahim said. “So governments lose control over what actually makes societies function.”
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He warned that the murky nature of those attacks makes them particularly difficult for NATO to confront.
“Many times, you cannot trace exactly where a lot of this interference is actually coming from — [attacks on power stations] or internet and telecommunications, et cetera,” Ibrahim said. “There’s always some sort of plausible deniability if it’s done by an actor who’s very capable.”
Ibrahim said NATO may need to rethink how it responds to such threats.
“NATO really does have to kind of reconfigure its posture to understand that these kinds of attacks are equivalent to essentially any sort of kinetic attack,” he said.
He also called for the alliance to establish clearer consequences for hybrid attacks attributed to Moscow.
“We now need to start going on the offensive in terms of hybrid warfare and understanding the threat and pushing back and sending a very clear signal to Moscow that such threats will not stand,” he said.
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Lithuania, which directly borders Kaliningrad, dismissed Russia’s accusations and said NATO poses no threat to Moscow.
“Russia’s insinuations and threats have no basis. NATO is a defensive alliance and poses no threat to Russia or any other country,” Lithuania’s Foreign Ministry told Fox News Digital. “Russia’s threatening is intended to fracture transatlantic unity and impede our support to Ukraine. Russia will not achieve its goals.”
The ministry vowed that Lithuania would continue strengthening its defenses alongside NATO allies.
“We strongly condemn any threats to use force and irresponsible nuclear rhetoric. Russia must stop its aggression against Ukraine… Lithuania is strengthening its national defense system and capabilities, including air defense,” the ministry said. “We train with our allies and work alongside NATO forces deployed in Lithuania. We are prepared to defend every inch of NATO territory and respond to any threats.”
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Retired Air Force Lt. Gen. Richard Newton warned against brushing off Moscow’s language simply because Russia has issued nuclear threats before.
“NATO should take Russia’s warning seriously that it could resort to employing nuclear weapons against the alliance should Kaliningrad be cut off from Russia. We are in the midst of Russia employing ‘gray zone’ coercive actions against NATO nations, so this pronouncement should not surprise the West,” he added.
Filipetti similarly cautioned that nuclear rhetoric itself can create dangerous opportunities for miscalculation.
“NATO is a defensive organization that is in no way threatening Russia’s position on Kaliningrad,” she said. “That said, any time there is a public threat of nuclear attack it must be taken seriously, especially with someone like Putin.”
“Nuclear bombs are a potentially world-altering technology,” Filipetti added. “It is not only their use, but the threat of their use, that could cause significant miscalculations and escalations.”
Russia denies conducting hybrid warfare against European countries and says NATO activity around Kaliningrad is instead driving the region toward confrontation.
Kremlin spokesman Dmitry Peskov described Moscow’s latest warnings as reminders aimed at “hotheads in Europe.”
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