One hundred days ago, before sunrise, Russia launched artillery strikes on Ukraine before sending troops racing toward major cities, beginning a war against a much smaller country and outnumbered military that seemed destined to quickly topple the government in Kyiv.

But the brutal invasion has ripped apart those predictions, reawakening old alliances, testing others and spreading death and destruction across the country. Both armies are now locked in fierce and bloody battles across a 960-kilometer-long (600-mile-long) front for control of Ukraine’s east and to gain the upper hand in the conflict.

The winner, if there is one, is not likely to emerge even in the next 100 days, analysts say. Some foresee an increasingly intractable struggle in eastern Ukraine and a growing confrontation between President Vladimir Putin of Russia and the West.