Could a military drone, plane or bird have collided with Russian Aircraft?

There is no explosive residue but what if an Israeli or Egyptian drone collided with the Russian Aircraft by accident because of being military they might not have been openly flying in that airspace?

So, even though ISIS claims responsibility for this crash, there is no evidence of bomb or missile residue to substantiate this claim. Also ISIS or ISIL is not known for telling the truth about anything.

Both Egypt and Israel have had a lot of problems with ISIS and other terrorist groups in the Sinai so it is not far fetched that Israel or Egypt might have drones or planes patrolling this area of the Sinai.