to NDH control with the approval of the Military Commander in Serbia, and became a formal part of the NDH on 10 October 1941, forming the Zemun and Stara Pazova districts of the Vuka County of the NDH. The local Volksdeutsche soon asked for the area to be returned to German control, but this did not occur. As a result of the transfer of this region, the borders of the NDH then reached to the outskirts of Belgrade. Western border Much of the western border between the occupied territory and the NDH had been approved by the Germans and announced by Ante Pavelić on 7 June 1941. However, this approved border only followed the Drina downstream as far as Bajina Bašta, and beyond this point the border had not been finalized. 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. Sandžak The Sandžak 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 Italian 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 town of Novi Pazar remained in German hands. 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. Kosovo The line between the German occupation territory and Italian Albania in the Kosovo region was the cause of a significant clash of interests, mainly due to the important lead and zinc mines at Trepča and the key railway line Kosovska Mitrovica–Pristina–Uroševac–Kačanik–Skopje. Ultimately the Germans prevailed, with the "Vienna Line" extending from Novi Pazar in the Sandžak through Kosovska Mitrovica and Pristina, along the railway between Pristina and Uroševac and then towards Tetovo in modern-day North Macedonia before turning northeast to meet Bulgarian-annexed territory near Orlova Čuka. The Kosovska Mitrovica, Vučitrn