This content was produced in Russia, where the law restricts coverage of Russian military operations in Ukraine

Russian nationalists and some lawmakers have demanded punishment for commanders they accused of ignoring dangers as anger grew over the killing of dozens of Russian soldiers in one of the deadliest strikes of the Ukraine conflict.

In a rare disclosure, Russia’s defence ministry said 63 soldiers were killed on New Year’s Eve in a fiery blast that destroyed a temporary barracks in a vocational college in Makiivka, twin city of the Russian-occupied regional capital of Donetsk in eastern Ukraine.

Russian critics said the soldiers were being housed alongside an ammunition dump at the site, which the Russian defence ministry said was hit by four rockets fired from USmade HIMARS launchers.

Ukraine and some Russian nationalist bloggers have put the Makiivka death toll in the hundreds, though pro-Russian officials say those estimates are exaggerated.

Russian military bloggers said the extent of the destruction at Makiivka was a result of storing ammunition in the same building as a barracks, despite commanders knowing it was within range of Ukrainian rockets.

Igor Girkin, a former commander of pro-Russian troops in eastern Ukraine who is now one of the highest-profile Russian nationalist military bloggers, said hundreds had been killed or wounded.