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The Donbas has become a battle of attrition with high casualties on both sides.

In this film, we examine the impact of the war on the Russian side from the 331st regiment's home in Kostroma to the evolution of symbols painted on their tanks.

In April, we confirmed 39 soldiers had been killed but now we estimate the total number of casualties to be between 400-500, almost half of the regiment's strength from the beginning of the war.

Analysing official and social Russian media, we can continue the story of the elite unit who are still trapped in a conflict that's claiming more and more lives.

Diplomatic Editor Mark Urban's exclusive report.