region was initially divided between the Germans in the north and the Italians in the south using an extension of the so-called "Vienna Line" which divided Yugoslavia into German and Italians zones of influence. The border of the occupied territory through the Sandžak was modified several times in quick succession during April and May 1941, eventually settling on the general line of Priboj–Nova Varoš–Sjenica–Novi Pazar, although the towns of Rudo, Priboj, Nova Varoš, Sjenica and Duga Poljana were on the Italian-occupied Montenegrin side of the border. The NDH government was unhappy with these arrangements, as they wanted to annex the Sandžak to the NDH and considered it would be easier for them to achieve this if the Germans occupied a larger portion of the region. Hungarian occupation After discussions with both the Romanian and Hungarian governments, Adolf Hitler decided that the Bačka and Banat region would be divided by the river Tisa, with the eastern portion being placed under German occupation along with "Old Serbia". The western portion of the Tisa was occupied and annexed by the Hungary. The Romanian-Hungarian rivalry was not the only reason for retaining the Banat under German occupation, as it also contained some 120,000 ethnic Germans (or Volksdeutsche) and was a valuable economic region. In addition to the Tisa, the other borders of the Banat were the Danube to the south, and the post-World War I Yugoslav-Romanian and Yugoslav-Hungarian borders in the north and east. Croatian occupation Much of the western border between the occupied territory with the NDH had been approved by the Germans and announced by Ante Pavelic on 7 June 1941. However, the approved border only followed the Drina downstream as far as Bajina Bašta, and beyond this point the border had not been finalised. On 5 July 1941 this border was fixed as continuing to follow the Drina until the confluence with the Brusnica tributary east of the village of Zemlica, then east of the Drina following the pre-World War I Bosnia and Herzegovina-Serbia border. An area of eastern Syrmia was initially included in the occupied territory for military and economic reasons, especially given Belgrade's airport and radio station were located there. The number of Volksdeutsche living in the area along with its role in providing food for Belgrade were also factors in the original decision. During this early period the border between the occupied territory and the NDH ran between