Comment by Balinares

I'd agree, although only in those rare cases where the Russian soldier, his missile, and his motivation to chuck it at you manifested out of entirely nowhere a minute ago.

Otherwise there's an entire chain of causality that ends with this scenario, and the key idea here, you see, is to favor such courses of action as will prevent the formation of the chain rather than support it.

Else you quickly discover that missiles are not instant and killing your Russian does you little good if he kills you right back, although with any chance you'll have a few minutes to meditate on the words "failure mode".