The Chinese military released Thursday images of an intercontinental ballistic missile it test-fired the previous day, with observers saying it was likely a Dongfeng-31 AG capable of reaching the U.S. mainland. Beijing’s second publicized ICBM launch into the Pacific Ocean Wednesday morning since its successful test-firing in May 1980 has sparked speculation that it may be sending a signal to the United States and its allies amid rising tensions in the Taiwan Strait and South China Sea. The Dongfeng-31 AG ICBM was unveiled to the public during a military parade in July 2017 in Inner Mongolia t…