Amur class submarines. In spite of the expectations, Chávez didn't sign the deal. Ten months later in April 2008, Venezuela decided to negotiate with Russia a loan of about $800 million for the acquisition of 4 diesel Project 636 Kilo class submarines. During that time Venezuela was also considering the purchase of 12 Il-76 transport aircraft. The submarines plus the aircraft were going to cost a total of $1.5 billion. However, this acquisition deal wasn't completed either. The negotiations for the purchase of the submarines broke down and 6 submarines that were once planned for Venezuela are now being offered to Vietnam. Russian loans and the Chinese K-8W light jet In September 2008, Russia provided Venezuela with a $1 billion loan to buy Russian weapons. A Kremlin source said "The Russian side has made the decision to extend to Venezuela a $1 billion loan for a military cooperation program." There is a lot of speculation about which weapons will be bought with that loan. Venezuela has shown interest on the following weapons: TOR-M1 SAM systems, T-72 tanks, Su-35 jet fighters and Il-76 military cargo aircraft. Despite of the interest and the Russian credit line, no deal has been finalized. In October 2008 Rosoboronexport informed that Venezuela was close to buying among other things a "large shipment of BMP-3" infantry fighting vehicles. However, that deal too wasn't finalized. Also in September Chávez confirmed that Venezuela purchased 24 K-8 Karakorum trainer jets from China. The deal, which is estimated to be worth between $72–$84 million, was the biggest Venezuelan arms deal of 2008. On 21 July 2010, one K-8W crashed during a training flight. A statement by Venezuelan Air Force commander blamed engine failure. Both pilot and assistant ejected. Venezuela acquired an undisclosed number of SA-24 Igla-S man-portable surface to air missiles. The SA-24 Igla-S is the most advanced version built in Russia. This acquisition was only confirmed after 50 SA-24 Igla-S were paraded by soldiers in Caracas in April 2009. In reaction to the acquisition the US State Department declared: "We are concerned about Venezuelan arms purchases that exceed its needs and are therefore potentially destabilizing." In September 2009 Russia agreed to loan Venezuela over $2 billion to finance the purchase of weapons including tanks and advanced anti-aircraft missiles. It was stated that because of lower crude prices, the country needed to borrow the money for defence spending to avoid cuts