Hungary–Romania relations
During World War II, Hungary and Romania became allies and participated in the war against the Soviet Union. But after the coup on 23 August 1944 Romania switched sides and fought against Hungary. Consequently, Soviet and Romanian troops invaded Hungary, occupied Northern Transylvania by October 1944 and re-established the Romanian administration in the region in March 1945. The 1947 Treaty of Paris reaffirmed the borders between Romania and Hungary as originally defined in Treaty of Trianon 27 years earlier, thus confirming the return of Northern Transylvania to Romania.
Vasile Morțun
As Interior Minister, Morțun took part in the Crown Council meeting of August 1914, supporting Romania's neutrality in World War I; and in the session of August 1916, where he backed Romania's entry into the war on the side of the Allies. During the two years of neutrality, he led counterespionage efforts against the Central Powers, who had numerous spies working in the country, and coordinated efforts by the Romanian Police to lay the groundwork for the eventual seizure of Transylvania from Austria-Hungary. Once Romania entered the war, the ministry was involved in securing provisions for the army and ensuring public order, including in newly occupied territories.