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There is also a genuine case for National security in that - during the Second World War - releasing that information would (IMO) let the enemy know what maintenance was being held back, in bombers.
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That war ended at some point.
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Absolutely - but another war quickly replaced it (actually several did)

WRT to this instance - I would likely argue that 50 years should have been more than enough time keeping the embargo

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Wars quickly replace one another, how unfortunate!

Or we have just independently rediscovered why most regimes seek the justification of some external threats to strengthen their power over their population, 1984 style.

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The planes in question would have been obsolete by that point, also those planes from WW2 would have already been widely distributed among allied (including Soviet) countries
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