The Chinese spy balloon might be down, but the diplomatic temperature continued to rise Sunday as officials in Beijing blasted the U.S. decision to shoot it out of the sky. 

Describing it as “a clear overreaction,” Tan Kefei, a spokesperson for China’s Defense Ministry, said in a statement Sunday that his country reserved “the right to use necessary means to deal with similar situations.” In a similarly strongly worded statement, China’s Foreign Ministry said it was “a serious violation of international customary practice.” 

Both statements described the balloon as a “civilian unmanned airship,” and China had previously said the orb was used for research and “meteorological purposes.”