Top-secret documents leaked online in recent weeks reveal China has deployed an intermediate-range hypersonic missile that can hit targets thousands of miles away and has a “high probability” of penetrating US defenses, according to a report. The chilling assessment of the enhanced strike capabilities of Beijing’s People’s Liberation Army is in one of a slew of confidential Pentagon papers uploaded to online message boards since late last year, federal investigators say. The documents have also revealed US intelligence about the strength of Russia’s military, indicated plans for Ukraine’s spring counterattack, and detailed intelligence gathered about US allies. The FBI arrested...