the rule states that newly purchased units may be placed in home country cities even if they were previously captured.
This means that the russian can grow units behind the german lines if those cities were left unoccupied or even in a zone of control??
Seems bogus to be able to grow THree tank Corps behind the lines where did they get the manpower and material?
Several games have this same mechanic...Totaler Krieg: Axis Empires and Proud Monster Deluxe come to mind. In those games its part game mechanic-based (better garrison your territory) and partly based on representing anti-partisan activity, etc. PMD limits it to a single INF unit, but I don't believe TK:AE has any limits on what can be placed in a valid city.
Note that the rules of TSC are unclear if a ZOC prevents placement (3.3 "Hexes into which a unit exerts a Zone of Control (see 6.0) are
called controlled hexes. ") versus 10.2.1 "If a player’s home nation city was previously captured, but left unoccupied, newly purchased corps may be placed there!"... "unoccupied" is a different scope than "uncontrolled"). By a strict reading of RAW (Rules As Written), the enemy city can be /controlled/ but /unoccupied/, and therefor placement of reinforcements could occur into an enemy CONTROLLED city (if it is unoccupied).