Russia and Ukraine on Sunday accused each other of violating an Easter truce announced by Russian President Vladimir Putin.
Ukraine's President Volodymyr Zelensky said Russian forces were continuing their shelling and assaults along the front line despite Putin announcing the surprise truce.
The 30-hour truce starting Saturday evening to mark the religious holiday would be the most significant pause in the fighting throughout the three-year conflict.
But Zelensky accused Russia of having maintained its attacks on the front line after the truce started.
Russia's defence ministry in turn said it had "repelled" attempted assaults by Ukraine and accused Kyiv of launching drones and shells, causing civilian casualties.
Zelensky said Sunday, citing Ukrainian commander-in-chief Oleksandr Syrsky, that "an increase in Russian shelling and the use of kamikaze drones has been observed since 10:00 am (0700 GMT)". Earlier he said that the first six hours of the ceasefire saw "387 instances of shelling and 19 assaults by Russian forces," with drones "used by Russians 290 times".
Ukraine's air force on Sunday morning had not reported any drone or missile attacks, however.
AFP journalists heard explosions on Sunday morning around a dozen kilometres (seven miles) from the front line in east Ukraine.
Ukraine will respond "symmetrically" to any attacks, Zelensky said, accusing Russia of "attempting to create the general impression of a ceasefire" while continuing isolated attacks
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