Of coarse I wouldn't dream of telling you how to handle your own personal business, but I will say that if it were me I'd wait until delivery before sending a dime. Even after agreeing to send partial payment upon receiving tracking numbers. If it's more than acceptable for Mihail to make promises he does not keep, then turning that around on him is more than justified in my mind.
I can be very patient as long as I'm told the truth. Once lied to I loose all patience and respect. Of coarse once they arrived and everything met my satisfaction I'd send the promised payment.
Good luck, I'll cross my fingers for you.