i have sent these scans around for possible accurate identification(s).
if they arrive in due course, the results will be posted on the thread.
this just in from a former Leningrader: the dancers are Kaleria Fedicheva and Vladlen Semyonov.
p.s. the same Leningrader now says that suggesting Fedicheva might not be correct and advises waiting for others familiar with Kirov dancers of the period to chime in.