8th February, 1926. After increased anger among the Aldranian city of Lewitzsk (the one bordering the port) thousands of Aldranians rose up, taking arms depots left by the Aldranian government. They demanded independance or democratic elections. This inspired not only other Aldranian majority provinces and one Laurentian majority province to rise up in rebellion but also the Aldranian government to move, since the areas Laurentia now control are planes, perfect for tank encirclements we establish a massive encirclement, using infantry to back up and secure the encirclement. Being in planes, which are the Aldranian's specialty mounting a major counterattack would require you to build an airforce as big as ours, change your entire doctrine and then invade to mixed results. With a sizeable ammount of soldiers trapped and unnable to respond to the massive revolts it can be stated that you might want to listen to the revolt.
Now, about the Aldranian SSR. Communists conducted atrocities so bad in Aldrania that after they were overthrown by the monarchy they were seen as evil, a taboo and sympathizing with communism would be seen as evil by the populace and still does. IE we are basically poland when it comes to communist support.