I met a retired ex-pat captain who flew one of the heavy KAL tri-jets (I think) with a flight engineer. He said that every command given to his Korean FO was refererred back to the older flight engineer, by means of an anxious glance, for the "the nod". Apparently, by tradition the FE had automatic seniority because of his age.
He said the whole time he felt like he had "a saboteur on the flight deck."
And someone else descibed an ex-pat Captain and local FO fighting with opposite yoke inputs on a take off - captain pulling up & FO pushing forward. Eventually smacked the nose down and wrote off the hull. Can anyone verify that caper?