part of which included fitting them with night vision capabilities. The Mi-24 proved to be highly vulnerable to Russian separatist attacks during the 2014 Russian military intervention in Ukraine. With the exception of captured aircraft in Crimean airbases the Mi-24 had the highest loss rate of all aircraft in Ukraine's inventory, with 5 being shot down and 4 damaged during the conflict. Developments towards restoration Starting in 1993 the United States National Guard worked with the Ukrainian Air Force as part of a NATO sponsored program. The Ukrainian Air Force worked with the California Air National Guard's 144th Fighter Wing. During which time the National Guard pilots worked with Ukrainian pilots during various joint exercises including in 2011 and 2018. On 19 March 2014 repaired L-39 were transferred to the 203rd Training Aviation Brigade. On 4 April 2014 a single repaired MiG-29 is transferred to the 114th Tactical Aviation Brigade. On 29 May 2014 a decision is taken to consolidate all MiG-29 repair the Lviv Aviacon Plant. On 6 July 2014 a repaired Buk-M1 is transferred to the Air Defense Forces. On 31 July 2014 a single repaired MiG-29 is transferred to the 40th Tactical Aviation Brigade. On 5 August 2014 an order No. 499 was issued allocating finances to modernize all Su-27 to the Su-27B1M, Su-27P1M, Su-27S1M. On 30 August 2014 a single repaired An-26 is transferred to the 15th Transport Aviation Brigade. On 3 October 2014 Kanatovo Air Base in the Kirovograd Oblast is brought back to life. There were plans to begin licensed production of the Saab JAS 39 Gripen fighter in Lviv. However, these plans have stalled since 2014. Russo-Ukrainian War On Thursday, 24 February 2022, the Air Force began to respond to the advance of Russian Aerospace Forces planes and materiel towards Ukrainian skies as part of the country's invasion by the Russian Armed Forces. The Russian Defence Ministry has claimed that over 100 air defence systems and over 90 aircraft have been disabled or destroyed as of 6 March 2022. No official figures from the Ukrainian Defence Ministry were immediately available. According to US defense officials, UKAF still has 56 operational fighter jets as of 11 March 2022. In April 2022, an unspecified country has offered parts to help Ukraine restore 20 aircraft to operational usage, US defence official claimed. On 19 September, US Air Force General James B. Hecker said that Russia has