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He did leave open the possibility of changing the composition of forces to help the United States keep pressure on the militant group.

“Russia has preferred to deal with state institutions over militia, but that hasn’t always been practical due to the composition of forces fighting the insurgency,” he said.

“Encourage the composition of forces to become broader, more integrated, multifunctional and flexible,” he was quoted as saying.

First there is heterogeneity among progenitors which "generates new deviations by composition of forces"; in other words new patterns arise from the mingling of diverse hereditary contributions in fertilisation.

But a few minutes' calm thought would teach any one familiar with the composition of forces, that an attempt at the imitation of a bird's flight must be a failure in man.