@erinmores
Indeed, your scenario is just another example for the fact that TripleA, especially in Global, enforces many of the rules but not all of them.
The Russian tank (if I have understood your scenario correctly) of course should not be allowed to combat move into Germany controlled Yugoslavia because of the presence of an Italian unit there - while Russia is not at war with Italy (“Powers Not at War with One Another”-rules).
So it is always the responsability of the players to act according to the rules. What is true for the boardgame is true for TripleA, too.
The game notes provided with the Global map list a lot of the known limitations and how to deal with them.
Also you might want to look at some related stickies in the TripleA-Support Category, where I moved your topic to.