I'm getting ahead of myself without explaining this important detail.
Before World War II, only 4 countries had developed workable color film formats:>USA>Germany (which had been a major beneficiary of the second industrial revolution, and whose population was actually only slightly less than USA at this time)>Britain (sort of, Dufaycolor and Gasparcolor were not true projection color format/viable at volume with teething problems respectively)>USSR (had a two and three color process even before 1939-but essentially abandoned the latter in favor of Agfacolor).
When USSR reached the burned corpse of eastern germany at the end of ww2, they came upon the optical plants zeiss, meyer-gorlitz, Erneman, Ihagee, and the major plant for AGFA film in Wolfen.
After basically working their asses off to have a viable three color format without any of the subordinate mature technology, the superior maturity of agfacolor was apparent and under political orders, shitloads of Agfacolor film was carted back to the motherland (guess what, after >20M of your flesh and blood die in such a conflict, and you win, you can do this).
After much blood sweat and tears into tri-pack format, the political demand for color changed to "just fucking copy this".