俄军集结威胁乌克兰东部关键城市——顿巴斯防线瓦解风险升温

俄军集结威胁乌克兰东部关键城市——顿巴斯防线瓦解风险升温

Russian troop build-up threatens city seen as key to seizing Ukraine's Donbas

If Kostyantynivka falls, Russian forces would be able push towards Ukraine's last remaining strongholds in the east.