La sombra del zar amarillo

I confess to not having seen this in 30 years,but politics and aging aside,I still remember it as a film that took on a different/ not usual subject(Red China) and had Gregory Peck giving an all out performance as a "layman" spy . It had a somewhat novel gadget factor with the monitoring listening device and the introduction of Mao's country as another "Player" in the big game of world control.The chase for the border was tense and very memorable (the U.S. actually working with the Soviets...who woulda thunk it?)It also boast top-notch production qualities(Score, direction and a fine supporting cast.)There's a funny part that I still remember ... Military guy Arthur Hill is taking the trigger-detonator of Peck's "brain-bomb" from a safe and noticing there's a "skull and crossbones" on it. Hill-"Whose the joker who did this?".........