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I agree with you, some sources are even saying that hundreds of Russian killed in that strike.

Numbers are highly doubt able but this report says more than 200 Russian contractors may have been killed in the US strikes.
https://thedefensepost.com/2018/02/10/russians-killed-coalition-strikes-deir-ezzor-syria/

Bloomberg mentioned it. Waiting to see if Antiwar.com picks it up.