Russia has threatened to block NATO from using its airspace for operations in Afghanistan if member states did not stop 'hostile' policies towards Moscow, the Kremlin's top diplomat in Kabul said. "Russian air space is still open, but if the NATO countries continue their hostile policies with regard to Russia, definitely this issue will happen," Zamir Kabulov told BBC Radio in an interview aired on Thursday. NATO imports most of its logistics via Pakistan to Afghanistan, but also uses Russia's air space for some cargo. Russia is fiercely opposed to further NATO expansion. Kabulov said the United States had made far too many mistakes since toppling the Taliban government in 1991. "During the past six-and-a-half years, they have strengthened their military presence instead of strengthening the Afghan government, the Afghan armed forces and the Afghan economy, and this is a main and fundamental mistake."