- Photos: Askold Krushelnycky MARIUPOL, Ukraine — On the edge of the city here, members of the 37th Mechanized Infantry Battalion are living in cramped bunkers sunk about 8 feet into the black earth of farm fields. The small spaces are jammed with bunk beds, weapons, food and the occasional stray cat or dog. The conditions are rough, but not dismal, and reflect the battalion’s motto, “Nobody But Ourselves,” a nod to the reality that Ukrainians — and particularly members of this volunteer battalion — have to rely on their own resources to defend their country. When the fighting started last spring, Ukraine had approximately 4,000 combat-ready troops, serving in a military debilitated by corruption. The military’s best weapons had been sold off and training was minimal. In response, many Ukrainians began organizing themselves into volunteer battalions, like the 37th Mechanized Infantry Battalion. With about 430 men, the 37th battalion is one of over a dozen private battalions that have...