Ukraine’s Troops Fight War of Ambush and Skirmish Against Russian Invaders https://www.wsj.com/articles/ukraines-troops-fight-war-of-ambush-and-skirmish-against-russian-invaders-11647951516

BRUSSELS—Ukrainian forces have inflicted significant losses on Russia’s larger and better-armed military—blunting advances by Moscow on several fronts—using insurgency-style tactics that take advantage of their grab bag of available weapons, say military officers from NATO countries.
In a war of ambushes and skirmishes, mobile Ukrainian units have used their knowledge of the local battlefield and sought to hit Russian forces at their weak points, striking armored columns on main roads and undermining their ability to fight by disrupting supplies, say Western observers.
But the Ukrainians’ approach is more suited to choking the invading Russians in places they overextended than to mounting a major counteroffensive against massed forces, they say. That raises questions about Kyiv’s ability to dislodge Russian forces from territory they have occupied in the country’s south and east.