By Dawns early Light

On 18 July 1981 Captain V.A. Kulyapin reportedly used his Su-15 to ram a chartered Argentinian CL-44 during the 1981 Armenia mid-air collision, although Western experts believed this likely a self-serving interpretation of an accidental collision.
A 1986 RAND Corporation study concluded that the ramming attack was still a viable option for modern jets defending their airspace from long-range bombers if those bombers were carrying atomic weapons. The study posited that defending fighters might expend their weapons without downing the enemy bomber, and the pilots would then be faced with the final choice of ramming—almost certainly trading their lives to save the thousands who might be killed by a successful nuclear attack.