Moreover, international (UN) stipulations and norms did not permit military force to be introduced into the Indian state of J&K beyond what was agreed during the 1949 ceasefire.[30] Despite this, the IAF was able to prevent the PAF from gaining air superiority over conflict zones.[35] The small and nimble IAF Folland Gnats proved effective against the F-86 Sabres of the PAF earning it the nickname "Sabre Slayers".[citation needed] By the time the conflict had ended, the IAF lost 60–70 aircraft, while the PAF lost 43 aircraft.[30] More than 60% of IAF's aircraft losses took place in ground attack missions to enemy ground-fire, since fighter-bomber aircraft would carry out repeated dive attacks on the same target.