The combat crews of the S-400 air defence system drive to take up combat duty at the military drills in Belarus. AP

"It is planned that the (combat readiness) test will involve the movement of significant numbers of military vehicles, which can slow down traffic on public roads," the Belarusian ministry said in a statement.

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Against the backdrop of the Russian invasion of Ukraine, the ministry said the exercise posed no threat to its neighbours or the European community in general.

Belarus is a close ally of Russia. Russia calls its actions in Ukraine a "special military operation".

Areas of Ukraine adjacent to Belarus, including its capital Kyiv, came under Russian assault in the initial stage of the invasion which began in late February and followed joint drills held by Russia and Belarus.

Now, however, Russia has focused its attacks on Ukraine's eastern and southeastern regions.

Reuters