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The Russian investigation into the most recent Proton launch failure has not yet ruled out sabotage as the cause.
I think sabotage is highly unlikely, and their hint at it is mostly an effort to include all possibilities in their investigation.
Update: This report confirms my analysis. It appears the news story above was a bit overheated for the powers-that-be in Russia, and thus Deputy Prime Minister Dmitry Rogozin felt strongly compelled to correct the record immediately.