sentences:  Use of the Kh-28 was restricted by its weight, limited seeker head, bulk and fuelling requirements, and it was superseded by the smaller, solid-fuel Kh-58 (AS-11 'Kilter') in the early 1980s.Soviet offensive doctrine in the early 1960s assumed that widespread use of nuclear weapons would disable Western radar-based air defence systems through electromagnetic pulses (EMP) effects.Consequently, they paid little attention to the development of anti-radar missiles.