the way Hungarians were treated in those countries
Romania has diplomatic relations with 184 countries; see the list at the link below.
Romania has trade relations with the majority of the countries in the world.
Carpathian Mountains
Hungary is now surrounded by Austria, Slowakia, Ukraine, Romania, Slovenia, Serbia.
Diplomatic relations at embassy level
Bulgaria, Czechoslovakia, Hungary, Poland, Romania
Carpathian Mountains
very normal relations
Albania, Bulgaria, Czechoslovakia, Hungary, Poland, and Romania
Warsaw Pact.
East Germany, Poland, Czechoslovakia, Hungary, Romania, Bulgaria, Yugoslavia, and Albania. Three of these countries (East Germany, Czechoslovakia, and Yugoslavia) no longer exist.
After WWII, Poland, Hungary, Czechoslovakia, Bulgaria, and Romania became the USSR's satellite states.