Nine Indians.

22 July Militants in Luhansk abducted nine students from Nigeria.

24 July Militants released three Nigerian students, abducted in Luhansk.

Kidnapped nine, but three were released. Quite a suspicious fact. I decided to take note and control the process.
And exactly, on the news today:

28 July Militiamen knocked out a Ukrainian tank with black mercenaries, Reported «Russian news service» Press Secretary of the Donetsk People's Republic Pavel Puryshev.
«There were mercenaries among the Ukrainian army. The tank was knocked out, in which three crew members sat – black people», – he said.

Summing up — kidnapped nine, three were released, three were knocked out"

9 – 3 – 3 = 3

I.e, there are three more. Just in time for another tank crew. We are waiting for news from Donetsk about another damaged tank with black mercenaries.