has anyone taken a back to back tour to europe, we want to see both france and russia but with an escorted tour group, hopefully we won't have to fly back to jfk airport to start the second tour, would appreciate your comment

I presume you are travelling from USA where I gather the tour includes airfare, unlike Australia where you purchase airfares separately. We did 3 back to back tours, and on each there were Americans who were also doing a number of tours so I presume there shouldn't be a problem. Ask your Travel Agent they'll be able to help. Have fun planning.

We did back to back (good way to go) but both tours started in same city and resulted in a meager saving for doing two tours with same company.
Therefore, you shouldn't have to pay airfare twice (tho there may be additional charges from France to Russia.) Have a travel agent check with the escorted group you want to use.