suffering muslims

Dear scholars, As-Salamu `alaykum. During the month of Ramadan, all Muslims fast and do good deeds. According to Islam, we must not just sit back and watch any Muslim country being conquered or taken over by non-Muslim countries. During Ramadan, should all Muslims just sit back and watch while non-Muslim countries destroy a Muslim country in the holy month? I just don't understand. Do we fast just to fulfill our own duty to Allah while watching people suffer? Jazakum Allah khay ran.