The ally of the Russian Federation is reacting to the West’s build-up of forces near its border. This falls right into Russia’s hands. Because of the pressure built up in Ukraine by the forces on both sides, eastern Europe in its entirety is being forced to “choose sides”.
The same way that the EU/NATO forces take over nations through influence and bailouts, Russia is solidifying its sphere of influence in eastern Europe. Belarus is only the first chess piece to be in play.