Should have shot at all three. Don't complain to the UN, they are useless. You see three tanks from an enemy state entering Golan? Your response should be to make sure none of them return to that enemy state alive and in one piece. This is why Israel still has these problems, all they do is kvetch, they never fight back...well, now would be a good time to start....
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from the article: Three Syrian tanks enter demilitarized zone in Golan Heights