I don't know, I am not an expert on this.
However, I know that the war is going on for almost a year, and we are supporting Ukraine. I don't understand why we are letting them fight without any air force. Russia is much bigger, has more soldiers, has more planes, has more of everything, and is constantly bombing Ukraine's infrastructure while Ukraine has no response and can only defend itself. If we really want Ukraine to win, and I believe we do want them to win, we have to provide them with some modern aircraft. And with some modern tanks.