Emerging from the Soviet theatrical tradition, Aleksandr Alexandrovich Pyatkov built a versatile career on stage and screen, debuting in the mid‑1970s with roles such as the youthful explorer in “Adventures in a City that Does Not Exist” and a supporting part in Akira Kurosawa’s internationally acclaimed “Dersu Uzala.” Throughout the 1980s he appeared in a range of popular productions, from the mu…