Russia's defence ministry has blamed the illegal use of mobile phones for a deadly Ukrainian missile strike that killed 89 servicemen, raising the reported death toll significantly.
Moscow previously said 63 Russian soldiers were killed in the New Year's Eve strike, but on Wednesday announced more bodies had been found under rubble.
The ministry's reaction came amid mounting anger among some Russian commentators, who are increasingly vocal about what they see as a half-hearted campaign in Ukraine.
Most of the anger on social media was directed at military commanders rather than Russian President Vladimir Putin.
The Russian defence ministry said four Ukrainian missiles hit a temporary Russian barracks in a vocational college in Makiivka, the twin city of the Russian-occupied regional capital of Donetsk in eastern Ukraine.
Ukraine's military has said it launched a strike that resulted in Russian loss of equipment and possibly personnel near Makiivka, but it has given no further details.
Ukraine has said as many as 400 Russians were killed.
Although an official probe has been launched, the main reason for the attack was clearly the illegal mass use of mobile phones by servicemen, Russia's ministry said.
"This factor allowed the enemy to track and determine the coordinates of the soldiers' location for a missile strike," it said in a statement.