Ukraine Says Russian Forces Lead Major New Offensive in East

NOVOAZOVSK, Ukraine — Tanks, artillery and infantry have crossed from Russia into an unbreached part of eastern Ukraine in recent days, attacking Ukrainian forces and causing panic and wholesale retreat not only in this small border town but a wide swath of territory, in what Ukrainian and Western military officials are calling a stealth invasion.

The attacks outside this city and in an area to the north essentially have opened a new, third front in the war in eastern Ukraine between government forces and pro-Russian separatists, along with the fighting outside the cities of Donetsk and Luhansk.

Exhausted, filthy and dismayed, Ukrainian soldiers staggering out of Novoazovsk for safer territory said Tuesday that the forces coming from Russia had treated them like cannon fodder. As they spoke, tank shells whistled in from the east and exploded nearby.

Some of the retreating Ukrainian soldiers appeared unwilling to fight. The commander of their unit, part of the 9th Brigade from Vinnytsia, in western Ukraine, barked at the men to turn around, to no effect. “All right,” the commander said. “Anybody who refuses to fight, sit apart from the others.” Eleven men did, while the others returned to the city.