Irony can be deadly sometimes:

China will sell Iran 24 J-10 fighters that are based on Israeli technology, RIA Novosti reported Oct. 23. The aircraft have Russian-made engines and are based on components and technology Israel gave China after the cancellation of the Lavi project in the mid-1980s. The total cost of the planes, which are expected to be delivered between 2008 and 2010, is an estimated $1 billion.

UPDATE: China denies the story.