I've come to a decision: the Greek-Soviet alliance is annulled due to violation of Rule 1 (no metagaming). I do not inherently have a problem with expansion via war, but in this case the alliance violated any sense of reasonable role-playing (such as ideology), and so the only possible explanation is metagaming. I don't have an issue with the Greek-Turkish war; I only have an issue with the Soviet intervention on the side of Greece. However, because Greece was relying on the Soviet alliance, Mattsos has requested that I void the war. I have agreed.
So, essentially, both the war and the alliance are void. All other events have occurred as usual.
Expect a 1951 update tomorrow.