Hitler and Stalin agreed to partition Romania in 1939. In the Arbitration of Vienna, aka the Vienna Award of 1940, Hitler forced Romania to yield these areas, formerly part of the Russian empire, as well as Northern Bucovina, which had never before been ruled by Russia.
Cernauti, formerly known as Czernowitz, changed hands many times in WW1 before being occupied by the Romanians in 1918. It was probably the most “cosmopolitan” East European city, with large segments of Poles, Germans, Jews, Ukrainians and Romanians. Probably a few Magyars, too. Cernauti will exchange hands a number of times in the next few years, as well.
As for Romania, her ordeal is just beginning. The Soviets occupy Moldavia, and now the Hungarians are looking to take away Transylvania. Romanian coal, oil and grain, and her soldiers, are coveted by the Germans. She doesn’t have any real allies nor can she stand on her own. This isn’t going to end well.