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- Romania is the latest NATO member to say it will buy the F-35 stealth fighter jet.
- More alliance members are buying F-35s, but one of NATO's biggest militaries, Turkey, can't.
- Turkey is barred from the program because it elected to buy a Russian-made air-defense system.
Here's a sign that the world has changed since the Cold War: A former Warsaw Pact nation is buying US stealth fighters and the country with the second-largest army in NATO is buying Russian anti-aircraft missiles.