Russia will supply ally Belarus with Iskander-M missile systems, Russian President Vladimir Putin said in a televised meeting with Belarusian ruler Alyaksandr Lukashenka.
Putin said in the June 25 remarks that delivery of the weapons systems would take place within a few months.
The Iskander-M is a mobile guided-missile system with a range of up to 500 kilometers.
Putin and Lukashenka are meeting in St. Petersburg to mark 30th anniversary of establishing diplomatic relations between the two countries.
The talks come as Ukraine said it had come under "massive bombardment" from rockets "fired from the territory of Belarus and from the air" targeting the village of Desna in the northern Chernihiv region.
The Ukrainian military said infrastructure was hit but that no casualties had yet been reported.
"Today's strike is directly linked to Kremlin efforts to pull Belarus as a co-belligerent into the war in Ukraine," the Ukrainian intelligence service said.
Belarus is not a direct participant in the war in Ukraine, but it has provided logistical support to Russia's invasion that began on February 24, with some Russian forces entering Ukraine across the Belarus border.
Western nations have slapped Belarus, like Russia, with an ever-increasing list of financial sanctions in response to the Kremlin war on Ukraine and for Belarus’s efforts to aid the Russian invasion.