Fantastic film. Perhaps the best of the modern era in terms of nuclear war fiction. Invoking the plot lines of a number of many prior films without actually drawing them to their full conclusions.
That said, I felt there were several major problems.
First, the whodunnit.
The scenario is made possible by a certain amount of ambiguity as to whether the DPRK, PLA or Russia launched the initial missile, made possible by a failure of detection by an early warning satellite in a region in which all 3 nations share interests.
SAR imagery confirms destroyed airframes at the locations in part 3.
Adjusting suspected one Tu-22M location (52.901642, 103.575327) to 52.900303, 103.574194.
Adding third suspected Tu-22M: 52.895627, 103.582776