The FAA is seeking to replace its ageing force with a more capable and more serviceable modern aircraft. The acquisition of Spanish Mirage F1Ms, IAI Kfir Block 60s and Saab Gripen E/Fs was considered, but as of February 2015, all of those deals appear to have stalled; The Mirage F1 deal was scrapped by the Spanish government in March 2014 after pressure of the UK to not assist in FAA modernization over tensions between the countries over the Falkland Islands. The UK has also managed to veto the sale of Gripen E/Fs, as 30% of the Gripen's parts are manufactured there. The deal with Israel has reportedly stalled for technical and political reasons. China has reportedly offered JF-17/FC-1 or Chengdu J-10 to Argentina. The two countries have formed a working group to look into the transfer of 14 aircraft. Russia had also offered to lease 12 Su-24 strike aircraft to the FAA, but Jane's reported that the Su-24 would not be very useful to the FAA and that "it would appear that any proposed transfer of such aircraft is likely the result of Russia playing political games with the UK over the continuing crisis in Ukraine.". All Mirages were officially decommissioned on 30 November 2015. The A-4s were grounded for lack of spares; in any case only 4–5 were airworthy with the rest in storage at Villa Reynolds. When Barack Obama visited in March 2016, Air Force One was accompanied by US Air Force F-16s because Argentina could only offer Pucarás and Pampas for air defense.