My Russian Teacakes are too crumbly I am making Russian Teacakes.  They have been refrigerated per the recipe for approximately 4 hours.  I cannot roll the Teacakes into balls as the dough is too crumbly.  Help!
In the Russian teacake recipes I have seen, there are four main ingredients:


flour
butter
nuts
powdered sugar


If you cannot get your cookies to bind, you need to add more butter (the only ingredient with moisture). If you are refrigerating your dough, make sure to cover it so it does not dry out.