Just imagine, an 18-year-old in the east receives conscription orders - i.e. to join the Kiev army to fight against his pro-Russian father and/or brother and/or friends. He refuses, so gets branded a deserter, with a warrant out for his arrest, for not obeying conscription orders.
No need to imagine much, Turchynov himself admits that the East is not under control at all. So if you live there, you can basically do anything you want with the conscription order, like wiping your ass with it.
Things get more "blurry" for those who live in still under control regions: those guys will have a lot more trouble evading the police.
But basically all Ukrainian will have problems fighting their own people. At least the police is prepared to fight civilians, not as much the army.