China's foreign ministry said on Wednesday the United States has sent out wrong and grave signals to the so-called Taiwan military forces on the potential drone sale deal. China will take legitimate and necessary responses in light of the changing circumstances, Wang Wenbin, spokesman of the ministry told a regular briefing in Beijing. The U.S. State Department cleared the potential sale of four sophisticated U.S.-made aerial drones to Taiwan in a formal notification sent to Congress, the Pentagon said on Tuesday, the last step before finalizing a weapons sale that will further anger China.