Plot hole: Explosions are very predicable and leave very clear traces after detonation, and the precise epicentre of a small nuclear explosion could be established within a few meters. Experts from the United States military could show that the nuclear explosion originated outside the airbase, and the evidence they could show (aerial photographs, etc) would be irrefutable. They could even invite their counterparts in the Russian military to see for themselves. The only way Petrofsky's plan could have worked would be if he could somehow get the bomb inside the perimeter of the airbase - not a terribly likely proposition.
The Fourth Protocol (1987)
1 plot hole - chronological order
Directed by: John Mackenzie
Starring: Michael Caine, Pierce Brosnan, Ned Beatty, Joanna Cassidy
Genres: Thriller
Continuity mistake: When the troops are closing in around the house, Pierce Brosnan is listening to Tchaikovsky's 4th Symphony. At one point the music is reaching the end, then it cuts to a shot of a soldier moving in closer, and when it cuts back the piece is finishing - however, the difference in time between the last bit we heard and the end isn't long enough for it really to have finished.
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Suggested correction: The plan was to claim that a USAF fighter bomber carrying an unstable nuclear warhead had crashed while on approach to the airbase, causing the explosion.
What plan? This plot twist is not mentioned anywhere in the film or the book. The posting is absolutely correct.