Russia has said a new year missile attack that killed at least 89 Russian soldiers happened because troops were using mobile phones, defying a ban.
Officials say Turning on the phones and massive use of them allowed the enemy to locate its target.
Ukraine says 400 soldiers were killed – and another 300 wounded – in the attack on a college for conscripts in Makiivka, in the occupied Donetsk area.
It is the largest number of deaths Russia has acknowledged in the war.
The deputy commander of the regiment, Lt Col Bachurin, was among those killed, the ministry of defence said in a statement on Wednesday.
