Only some provinces of Serbia and Romania.
Serbia was not allied with Germany; Italy and Romania, yes.
Austria, Slovenia, Slovakia, Romania, Serbia, Croatia, Ukraine
Hungary and Serbia form the western border of Romania.
Yes it is.
Romania has boundaries with Ukraine, Moldova, Hungary, Serbia and Bulgaria.
Around Romania are: Bulgaria, Serbia, Hungary, Ukraine, Moldova.
Romania has borders with Hungary, Serbia, Bulgaria, Moldova and Ukraine.
Moldova: Romania, Ukraine Romania: Hungary, Serbia, Bulgaria, Moldova, Ukraine
Romania has boundaries with Serbia, Hungary, Ukraine, Moldova and Bulgaria.
Romania has boundaries with Bulgaria, Moldova, Ukraine, Hungary and Serbia.
Both Serbia and Ukraine border Hungary and Romania.