GeZe,
Yes, in Kremlin rules the lowest rated player can either pick options for axis or allies. One of these options is having neutral countries join your side. You can pick one major neutral and one minor neutral to place units in.
Major neutrals–------Units gained by having this neutral join your side
Switzerland-----------2 infantry and one fighter
Sweden---------------2 infantry and one submarine
Turkey----------------2 infantry and one armor
Spain------------------3 infantry and one armor
Peru-------------------2 infantry and one submarine
Argentina-------------2 infantry and one transport
Venezuela------------2 infantry and one armor
Minor neutrals(all minor neutrals get one infantry unit placed there)
Afghanistan, Mongolia, Rio de Oro, Mozambique, Angola, Rio de Oro, Eire.
So for example if I am picking for Axis I can have Japan take Turkey and Germany take Mozambique…or if I am picking for Allies I can have Russia take Switzerland and USA take Afghanistan.
So you see I can place a Russian infantry unit in Rio de Oro. :)