The F-35 Lightning II is arguably the most advanced fighter jet on the international market (there are export restrictions on the F-22 Raptor). The F-35 has been purchased by dozens of US allies worldwide, but the US does not just sell the jet to any country. Some countries would like to purchase the F-35, but the United States has blocked the sales for various reasons (the countries below are not an exhaustive list). The US is very protective of the F-35 fighter jet and does not want to see it compromised – although it does permit some countries to produce the F-35 locally under license.