In various verdicts, the International Criminal Tribunal for the former Yugoslavia (ICTY) concluded that Krajina presidents Milan Babić and Milan Martić were cooperating with Serbia's president Milošević who sent ammunition, financial assistance and the JNA and Serb paramilitary as back up during 1991 and 1992 in order to take over large chunks of Croatia. After the United Nations imposed sanctions against Serbia, the JNA formally withdrew from Croatia by May 1992. However, in the 2011 verdict regarding Momčilo Perišić, the ICTY established that Belgrade was, through the 30th and 40th Personnel Centre, still supplying armies of Krajina and Republika Srpska all until 1995, despite international sanctions. In the judgement, the judges ruled that members of the Yugoslav Army served under banners of Military of Serbian Krajina (SVK) and VRS, but received pensions, salaries, benefits and promotions directly from Belgrade. Although Perišić did not have effective control over the VRS, he had control of the SVK, but failed to sanction them for the Zagreb rocket attacks.