You are wrong Augusto, lets imagine you staying with armed gun and in front of you staying man with armed gun(like on wild west), your first think - "what will be if he shot first?" No chance to close combat, both sides will think about their Anti missle defence, that she maybe save some lives. You can read Russian army doctrine, nuclear weapon will be used immediately.
Do you remember when Russian airborn battalion take airport in Prishtina, why Britons did not kill them with their heavy tanks? Because they know, Soviet nuclear rockets always behind this small paratrooper unit.