China's military modernization -- particularly development of its strategic forces -- is driving the U.S. military to begin preparing for the advent of Beijing as a nuclear competitor on par with Russia, a development that will require a different deterrence strategy from the playbook the Defense Department has long maintained to counter Moscow, according to a senior U.S. military official. U.S. Strategic Command chief Adm. Chas Richard, speaking to reporters today at the Pentagon, also said China's strategic forces modernization...