“general international law contains no applicable prohibition of declarations of independence“ Sure, you can declare all day but who will recognize you and if

“general international law contains no applicable prohibition of declarations of independence“ Sure, you can declare all day but who will recognize you and if it's "illegal" in the country you want to leave, you will be jailed. If they do the ethnic cleansing that Serbia did in Kosovo then, you may have a better chance internationally. Changing of borders is frowned upon, almost every country has their own issues.