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... "According to intelligence, road construction in areas leading to Ukraine and the establishment of artillery positions are going on in the Belarusian border area," Zelenskiy wrote.

"We believe that Russia will once again try to involve Belarus in its war."

Zelenskiy said Ukraine had issued instructions to warn the Belarusian leadership of "Ukraine's readiness to defend its land and independence".

He also said intelligence showed that Russia was "attempting ... to carry out a regrouping of forces -- most likely to compensate for a shortage of personnel."

"In this regard, it becomes more evident why the armed forces increased their activity on the territory of Belarus." He did not provide further evidence.

Belarusian President Alexander Lukashenko, one of Kremlin leader Vladimir Putin's closest allies, allowed his territory to be used for part of Russia's February 2022 invasion of its smaller neighbour.

Lukashenko, in power since 1994, has said he has no intention of committing troops to the war in Ukraine.

But Belarus, which borders NATO members Poland, Lithuania and Latvia, has since agreed to deploy Russian tactical nuclear weapons and Russia's hypersonic Oreshnik missiles. ...