Finding elite Russian troops during 2014 Crimea annexation

On this day five years ago, Russian forces annexed Ukraine's Crimea peninsula - a move condemned internationally. Crimea has a Russian-speaking majority.

How did BBC journalists discover Russian special forces were involved, despite official denials from the Kremlin?

BBC Russian reporters Oleg Boldyrev and Olga Ivshina spoke to Maria Jevstafjeva.

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