You need to figure out your mins as well as putting up good walls; With both IMP and BZ Ukraine, you have much weaker defensive power, so even if you were to bounce back to defending all of your cities anyone as a competent Turk could come and take them from you with ease. Walling Odessa is a must nowadays, and I highly recommend you learn the Six-Inf/Mil Bigwall for Kiev as well to combat this. Points for creativity, though.