Moscow Threatens Nuclear Response Over Kaliningrad as Tensions Rise

Russia’s warning that it may turn to nuclear weapons if NATO seeks to cut off Kaliningrad from the rest of the country has renewed fears that the militarized Baltic exclave could become a dangerous flashpoint between Moscow and the alliance. Experts say the territory is already central to Russia’s campaign of hybrid pressure against Europe.

In a diplomatic document, Moscow told NATO that it could deploy “the entire arsenal of forces and capabilities at its disposal, including nuclear weapons” if alliance members tried to isolate Kaliningrad, Reuters reported Wednesday.

Kaliningrad is a Russian territory separated from the country’s mainland by other nations. Located on the Baltic Sea between NATO members Poland and Lithuania, it contains major Russian military installations and elements of the country’s Baltic Fleet.

The document also suggested that Russia could target “decision-making centers” in NATO countries at the very beginning of a conflict.

NATO dismissed Moscow’s claims in a response reviewed by News Media, emphasizing that the alliance is defensive and that its exercises and operations do not pose a threat to Russian territory. NATO also called on Russia to end its “irresponsible nuclear rhetoric.”

Carrie Filipetti, executive director of the nonpartisan Vandenberg Coalition, said Moscow has repeatedly relied on nuclear threats to discourage the United States and European nations from supporting Ukraine.

“Russia has threatened nuclear use before, including indirect references to tactical nuclear strikes during the early stages of Putin’s invasion of Ukraine,” Filipetti told News Media. She pointed to Russia’s lowered stated threshold for a nuclear attack in 2024, its decision to place nuclear forces on heightened alert and the resumption of nuclear testing. “Putin uses these threats regularly because he views them as a way to deter Europe and the United States from continuing their support for Ukraine.”

Filipetti said the latest warning came after several developments, including NATO aircraft being scrambled in response to Russian planes, U.S. and NATO air exercises conducted near Kaliningrad last month and escalating tensions linked to the war in Ukraine.

She argued that the timing also points to growing pressure on Moscow as the conflict continues. Filipetti previously served as a deputy assistant secretary at the State Department and as a senior policy adviser to the United States Mission to the United Nations.

“Putin appears to believe that momentum is shifting against him,” she said. “He is turning to increasingly aggressive rhetoric in an effort to weaken European backing for Ukraine, as he has attempted before.”

Dr. Azeem Ibrahim, a research professor at the Strategic Studies Institute at the U.S. Army War College and chief strategy officer at the New Lines Institute, said NATO should not dismiss the warning. He noted that Kaliningrad has a much broader role in Russia’s confrontation with Europe.

Ibrahim said NATO has traditionally focused on the prospect of conventional warfare involving “tanks and troops and divisions.” Russia, however, is increasingly employing tactics aimed at weakening the infrastructure and systems that allow civilian life to continue.

“Russia is adopting a fundamentally different approach,” he said, describing a hybrid warfare strategy aimed at “infrastructure” and at “societies in general — what keeps societies functioning.”

He characterized Kaliningrad as the “front line” of that Russian strategy.

“It has effectively become a Russian fortress,” Ibrahim said. He described the territory as a forward base for signals intelligence, communications interference and other tools used to conduct hybrid operations.

Ibrahim said those disruptions could form part of a wider confrontation, potentially targeting civilian communications and critical infrastructure before or alongside a conventional military strike.

“Interference operations like these could come first, leaving societies unable to function or respond effectively through emergency services and news and information networks,” Ibrahim said. “That can make it harder for governments to maintain control over the systems that keep society operating.”

The challenge for NATO, he said, is that such operations can be more difficult to attribute than a conventional assault.

“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.”

The ambiguity, Ibrahim argued, presents a challenge for an alliance built around collective defense against armed attack.

“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.

Asked what NATO and neighboring Poland and Lithuania should do following Russia’s warning, Ibrahim called for the alliance to establish clearer consequences for hybrid attacks.

“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, arguing that a sufficiently serious hybrid attack should be considered capable of triggering NATO’s Article 5 collective-defense clause.

Lithuania, which directly borders Kaliningrad, rejected Moscow’s warning and accused Russia of trying to undermine NATO unity and Western support for Ukraine. 

“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 News Media. “Russia’s threatening is intended to fracture transatlantic unity and impede our support to Ukraine. Russia will not achieve its goals.”

The ministry added: “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.”

The ministry said Lithuania would also continue providing “comprehensive support to Ukraine and its fight against the aggressor Russia.”

Retired Air Force Lt. Gen. Richard Newton told News Media, “In the weeks leading up to February 2022, many officials and commentators (myself included) weren’t sure Putin would actually invade Ukraine, even though there were a number of warnings and indicators he would do so.  And then on that Feb. 24, Putin launched the largest land invasion against Ukraine since World War II.”

“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 cautioned that regardless of whether Moscow intends to follow through, nuclear threats themselves carry risks.

“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 has denied Western accusations that it is conducting hybrid warfare against European states and has said it has no intention of attacking NATO countries. Moscow says NATO military activity around Kaliningrad is instead contributing to an increasingly dangerous confrontation.

Kremlin spokesman Dmitry Peskov characterized recent Russian warnings as diplomatic reminders to “hotheads in Europe,” Reuters reported Wednesday.

News Media reached out to the Polish and Russian embassies for comment but did not receive responses in time for publication.

Reuters contributed to this story.