Air Forces of Ukraine (literally Military Aviation Forces or Вiйськово-Повiтрянi Сили) to form the present-day unified Air Force of the Armed Forces of Ukraine (Повiтрянi Сили Збройних Сил України). 1991–2014 Since 1991's Ukrainian independence the Air Force has suffered from chronic underinvestment, leading to the bulk of its inventory becoming mothballed or otherwise becoming inoperable. The structural reorganization of the Air Force had set as goals for itself the sufficient reduction in the total number of command and control levels, and increasing the efficiency of command and control processes. The reorganization of command and control elements of the air force is still underway. The first step of this organization was to transition from the existing air commands to the Command and Control and warning center systems. This will not only help eliminate duplications at the command and control levels, but will also contribute to an increased centralization of the command and control system, the multi-functionality of the command and control elements, and effectiveness of response to the change of air conditions. 2006 saw the definition of the functions and tasks, organization and work of the C2 and Warning Center as well as the mechanism of interaction with the establishment of the Air Operations Center and Joint Operational Command. During the command and staff exercise one of the Air Force Commands has in effect performed control of "C2 and Warning Center – formation (unit)" level. The An-24 and An-26 aircraft, as well as the S-300 and Buk M1 anti-aircraft systems, have been continually modernized, and their service life has been extended. An organizational basis and technological means for modernizing MiG-29, Su-24, Su-25, Su-27, L-39 has been produced. Given sufficient funding from the Verkhovna Rada, the Defense Industrial Complex of Ukraine, in cooperation with foreign companies and manufacturers, is capable of fully renewing the aircraft arsenal of the Ukrainian armed forces. In 2005, the UAF was planning to restructure in an effort to improve efficiency. Ukraine was planning to put more advanced jet aircraft into service. Possibly buying newer SU-27s and MiG-29s from Russia. The plans were, that from approximately 2012, Ukraine would have to either take bold steps to create a new combat aircraft or purchase many existing combat aircraft. Due to the lack of funding, technical modernization was continually postponed. The Ukrainian air-force continued to use armament and military equipment which functioned mainly thanks to so-called ‘cannibalization’ (obtaining spare parts