“Yesterday, there was some rather unusual activity along the Ukraine-Belarus border on the Belarusian side,” Zelensky said in his daily evening address to the nation.“We are closely monitoring the situation, keeping everything under control, and will respond if necessary,” he added, without providing further details about the troop movements, military deployments or the nature of the activity observed.

Ukraine’s air force and border guard did not immediately comment on the statement.The remarks come after Kyiv had in recent weeks publicly urged Belarus not to increase its participation in the conflict, warning against any actions that could expand the northern front of the war.

Belarus, a close ally of President Vladimir Putin, allowed Russian forces to use its territory as a staging ground during the initial phase of Moscow’s full-scale invasion of Ukraine in February 2022. Russian troops launched attacks toward Kyiv from Belarusian territory during the opening weeks of the war.

Although Belarusian forces have not directly entered combat in Ukraine, Minsk has continued to provide logistical and strategic support to Moscow, including hosting Russian troops, military exercises and tactical nuclear deployments announced by the Kremlin in previous years.

President Alexander Lukashenko has repeatedly denied plans for direct military intervention but has maintained strong political and security alignment with Russia throughout the conflict.The northern border remains a sensitive security zone for Ukraine, forcing Kyiv to maintain military readiness there even as intense fighting continues on the eastern and southern fronts.

Analysts say any renewed military buildup in Belarus could pressure Ukraine to divert troops from active battle zones, even if no immediate cross-border attack is planned.Zelensky’s warning comes as Ukraine continues to seek stronger Western military support while monitoring Russian troop activity across multiple fronts amid renewed battlefield pressure and broader regional instability.