Insurgency/asymmetric wars are not the same as direct warfare, which is what Russia is losing right now. Especially not when, in Vietnam they took 90% of the targets off board before beginning, i.e. not bombing above a certain parallel. Russia never held back in that manner. Vietnam still suffered 20x the casualty rate. Russia can't claim that either. Both Russia and China were supporting Vietnam too. And in Afghanistan they took the country in weeks, has Russia achieved that Ukraine? Again, 20x casualty rate was inflicted in the enemy. The only thing lost was interest. Now the Taliban are dealing with an insurgency, which has never really ended since 1973. So really, nothing was lost, they inflicted a 20x casualty rate on the Taliban and Al-Quaeda and the country is in the same crappy state it's been in for 50 years, there's no magic trick to fix that.