Feb 10 (Reuters) - Russian forces likely lost dozens of armoured vehicles in a single, failed attack near the eastern Ukrainian city of Vuhledar, British intelligence said on Friday, as one pro-Russian blogger warned of a "crisis" in troop command. Grey Zone, the semi-official Telegram channel of the Wagner mercenary group, said in a post that a "disaster is unfolding around Vuhledar, and it is unfolding again and again", blaming what it called a "crisis" in troop command. See here for a complete list of exchanges and delays