Yes it's in NATO but that doesn't make it European. It's capital is in Asia, a lot of it's population is In Asia, a lot of it's GDP is in Asia. The only exception is that the western half of the Bosporus is European, and that has a lot of people. It's not fully Asian, definitely Transcontinental. but we don't see people calling Egypt part of Asia, or Indonesia part of Oceania, even though that is a much more loosely defined region.