"Ukraine has scheduled a national presidential election for May 25 that may further legitimize the regime the Kremlin hates and wants to overthrow. The Kremlin may find it hard to resist the temptation to attack Ukraine and "liberate" the south and east while Russia is ready, the Ukrainian military weak, and the regime in Kiev unstable. Such a move could lead to more Western sanctions, but this risk maybe dwarfed by the vision of a major geostrategic victory seemingly at hand. The window of opportunity for an invasion will open during the first weeks of April and close somewhere around the middle of May. During his long rule Vladimir Putin has generally shown himself to be a shrewd and cautious operator, but his actions during the Ukrainian crisis have been rash. So far his daring has paid off. This, unfortunately, is precisely what could trigger more bold moves down the road.
This is why the period between now and the 8th of May are of particular interest because than he will be able to present his victory during a march. Both marches are celebrations of the Soviet victory over fascism, which is exactly the way Russia is branding the Ukr government now.