After months of grueling advances through minefields, small villages and open steppes, Ukrainian forces are making some progress along two major lines of attack, according to analysts, Ukrainian officials and Russian military bloggers.
The advances, while small in terms of territory taken, are compelling Moscow to redeploy forces, military analysts say.
Ukraine is trying to reach the Sea of Azov and drive a wedge into Russian-occupied territory.
Explosions again echoed at the bridge on Saturday, as the Russian military said it had thwarted a missile attack.
The Russian account could not be independently confirmed, and Ukrainian officials had no immediate comments on the episode.
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Ukrainian, Russian, Moscow, Washington, Ukraine, Azov, Crimean, Russia, Kerch