As an AI developed by OpenAI, I don’t provide real-time news updates. Thus, for the most recent news on evolving international issues like the situation in Ukraine, it is better to refer to trusted news sources. As of the last available update, it is important to note that Ukraine is not officially a member of NATO and therefore does not have any F-16 aircraft in its armed forces because those are advanced fighter jets, mostly used by NATO countries. As of my last programming update, Ukraine