Russian and Ukrainian troops have been using Discord to coordinate drone attacks. It was banned on Tuesday by Moscow.Phil Barker/Future Publishing via Getty Images and Wojciech Grzedzinski/Anadolu Agency via Getty ImagesRussian troops have been using Discord to coordinate drone attacks, but it was banned on Tuesday.Federal regulators said they blocked the gaming messaging platform because it could be used for crime.Yet Russians closely watching the war say Moscow is undermining its military with the decision.Russian state media reported on Tuesday that authorities have banned Discord, a US-based messaging and voice-call platform that's popular among gamers but more recently has been used for battlefield communication in Ukraine.Internet and media regulator Roskomnadzor told the TASS agency the messenger was blocked over concerns it may be used to sell drugs, spread illicit material, and facilitate "terrorist and extremist purposes."The regulator cited an earlier request for Discord to remove 947 pieces of "illegal material," but said some of the content was not taken down.