Ok, we're cool... About contractors (mercenaries): I believe there is a limited number of CIA and Blackwater operatives in eastern Ukraine,
but definitely less than the number of Spetsnaz ones (which started the trouble).
That thing is obvious to anyone with one functioning neuron..
Claiming that those rebels consists only of women and kids and retired military personal and volunteers is plain stupid.
But on the percentage , this is one thing I won't make any bets.
Don't know how many russian special troops are there and also I'm pretty sure that until now western undercover forces haven't made a real move and probable are just providing information and logistical training support. So , their number might be actually higher than the russian troops but with fewer soldiers fighting.
Thing will get pretty ugly when both sides will decide to send in more forces aimed 100% at combat.
Ps.
For your quote on the spetsnaz troops you'll be labelled as a fascist soon enough