Russia Restricted is an option that prevents Russia from Attacking in Russia’s first turn.
Russia may buy units, try for technology, but then they go directly to NON-COMBAT movement instead of Combat movement.
Russia may move any forces they please within their own territory, or to allied territories, but can take NO offensive action of any kind against Germany or Japan… no naval attacks, no SBR’s, no movement into enemey territory, even unoccupied enemy territory.
Russia may move and attack normally starting in Round 2.
It is generally seen as an advantage for the Axis to have this restriction since it means Japan will still hold Manchuria and Germany will still hold Ukraine/Eastern/Norway and have all of their initial units on G1 and J1 respectively.