Ukrainian President Volodymyr Zelenskyy warned Thursday that Russia may be preparing to launch a new military offensive from Belarus—possibly targeting a NATO member state—based on intelligence gathered by Ukrainian security services.

Speaking to reporters in Kyiv, Zelenskyy said the buildup of Russian forces and military equipment in Belarus suggests preparations for a major operation in the coming months. While he emphasized that Ukraine's northern border remains the most likely target, he said intelligence indicates Moscow is also considering strikes against NATO territory.

"We are seeing a significant concentration of forces in Belarus," Zelenskyy said. "This could be preparation for another attempt to take Kyiv from the north. But we also have information suggesting Russia may use Belarusian territory to attack a NATO member."

Balancing Act: Intelligence or Lobbying?

The warning must be understood in context. Ukraine has a clear interest in emphasizing the threat Russia poses to NATO, as such warnings tend to accelerate military aid and strengthen alliance resolve. Western intelligence agencies have grown cautious about Ukrainian threat assessments, particularly after some earlier predictions—including the timing of major Russian offensives—proved inaccurate.

However, U.S. and European officials confirmed they have observed increased Russian military activity in Belarus. A senior NATO official, speaking on condition of anonymity, said the alliance is "monitoring the situation closely" but sees no immediate indication of preparations to attack member states.

"There's definitely something happening in Belarus," the official said. "Whether it's preparation for a new offensive into Ukraine or something else, we can't say with certainty. But we're taking the threat seriously."

Michael Kofman, director of Russia studies at the CNA Corporation, noted that Ukrainian warnings serve a strategic purpose even if the immediate threat is unclear. "Zelenskyy needs to keep NATO engaged and worried," he said. "These warnings might be based on solid intelligence, or they might be calculated to generate attention. Probably some of both."

Which NATO States Are Vulnerable?

If Russia were to launch attacks from Belarus against NATO territory, the most vulnerable states would be Poland and the Baltic countries—Lithuania, Latvia, and Estonia.

The Suwalki Gap, a 65-mile stretch of Polish territory between Belarus and the Russian exclave of Kaliningrad, has long been considered NATO's most vulnerable point. Russian control of this corridor would cut off the Baltic states from the rest of the alliance.

Poland has significantly reinforced its eastern border since Russia's 2022 invasion of Ukraine, deploying additional troops and constructing physical barriers. The Baltic states, meanwhile, have hosted rotational NATO forces and have urged the alliance to pre-position larger combat units.

Karolina Hird, deputy director of the Russia team at the Institute for the Study of War, said any Russian attack on NATO territory would be "strategically irrational" given the alliance's conventional military superiority. "But rationality isn't always Putin's strong suit," she added.

Belarus: Client State or Co-Belligerent?

Belarus allowed Russia to use its territory as a staging ground for the initial February 2022 invasion of Ukraine, but Belarusian forces have not directly participated in combat. President Alexander Lukashenko, who has ruled Belarus since 1994 and depends on Russian support to maintain power, has walked a careful line between supporting Moscow and avoiding direct military involvement.

However, Russia has steadily increased its military presence in Belarus. In 2023, Moscow announced it had deployed tactical nuclear weapons to Belarusian territory, a move that significantly raised the stakes in any potential conflict involving the country.

NATO has made clear that an attack originating from Belarus would be treated as an attack by Russia, regardless of which forces carried it out. Article 5 of the NATO treaty—the collective defense provision—would be triggered, obligating all member states to respond.

Ivo Daalder, former U.S. ambassador to NATO, said the alliance's response to any attack would be swift and overwhelming. "There can be no ambiguity," he said. "An attack on one is an attack on all. Russia would be at war with NATO, with all that implies."

Strategic Messaging

Whether Zelenskyy's warning reflects genuine intelligence or strategic messaging, its effect is clear: keeping NATO focused on the Russian threat and the interconnection between Ukraine's security and European security.

Ukraine has repeatedly argued that supporting its defense is not charity but strategic necessity. If Russia prevails in Ukraine, Zelenskyy and other officials argue, NATO will face a more dangerous and emboldened adversary on its own borders.

To understand today's headlines, we must look at yesterday's decisions. Belarus has served as Russia's staging ground before. The question is whether Moscow would dare use it again—and whether the target would be Kyiv or something even more dangerous.

For now, NATO officials say they are preparing for all contingencies. But in the fog of war and intelligence assessments, certainty remains elusive. What is certain is that the stakes—for Ukraine, for NATO, and for European security—could hardly be higher.