Russia has deployed nuclear warheads to Belarus for joint military exercises, according to the Belarusian defence ministry, in a move likely to intensify concerns over escalation on NATO’s eastern flank and the legal boundaries of global arms control agreements.
The exercises, which began on May 18 and run until May 21, involve what Minsk described as the integration of nuclear-capable forces, including missile systems and air-launched platforms.
The Belarusian defence ministry released video footage it said showed heavy military equipment moving through wooded terrain, missile systems being prepared for launch, and naval and air units conducting coordinated drills.
Belarus said the exercises include scenarios involving the handling and deployment of nuclear-capable systems, although independent verification of whether live nuclear warheads have been transferred has not been possible.
The reports come amid heightened scrutiny of Russia’s nuclear posture following repeated signalling around its tactical nuclear deployment strategy.
Russia state media has also claimed that Iskander-M ballistic missile systems “equipped with special munitions” have been included in the drills, further fuelling concerns over nuclear escalation messaging.
The reported deployment raises questions over compliance with the Nuclear Non-Proliferation Treaty (NPT), which prohibits nuclear-weapon states from transferring control of nuclear arms to non-nuclear states and bars recipients from accepting such control.
Military analysts have long warned that exercises involving nuclear-capable systems in Belarus blur the line between deterrence signalling and operational deployment, particularly given the country’s role as a staging ground for Russia’s war in Ukraine.
Volodymyr Zelensky said he had discussed the risk of a renewed northern offensive with senior military commanders, warning that Russian forces could intensify pressure along approaches to Kyiv and Chernihiv.
“It is precisely from there that the Russians are considering scenarios for additional attacks against Ukraine,” he said in an evening address.
🚨⚡️Russia’s Defense Ministry says nuclear munitions were delivered to storage sites of a missile brigade in Belarus as part of joint military drills. pic.twitter.com/sUTfAAXfME
— RussiaNews 🇷🇺 (@mog_russEN) May 21, 2026
Ukrainian security services have since announced heightened defensive measures in northern regions, including increased monitoring along the borders with Belarus and Russia to prevent infiltration attempts and sabotage operations.
The exercises involve a large-scale mobilisation of forces. The Russian defence ministry said more than 64,000 personnel are taking part, alongside 7,800 pieces of military equipment, including over 200 missile launchers, more than 140 aircraft and drones, 73 surface vessels and 13 submarines, eight of them strategic nuclear-capable boats.
The scale and composition of the drills underline Moscow’s continued emphasis on integrated nuclear and conventional force readiness amid the ongoing war in Ukraine.
Kyiv Independent reported it could not independently verify claims that nuclear warheads have been physically transferred into Belarus for the exercises.
The manoeuvres come more than two years after Russian forces used Belarusian territory as a launchpad for the initial invasion of Ukraine in 2022, with northern regions including Chernihiv, Sumy and Kyiv oblasts remaining under intermittent attack from missiles, drones and cross-border operations.
For Ukraine, the latest developments reinforce long-standing fears that Belarus is becoming increasingly integrated into Russia’s military architecture, further narrowing security space along its northern frontier.
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