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By Natalia Zinets and Dmitry Madorsky KIEV/DONETSK-IZVARINO BORDER CROSSING Russia (Reuters) - The United States demanded Russia withdraw its equipment and personnel from Ukraine after Moscow sent in a convoy of trucks on Friday in what Kiev called a "direct invasion". NATO said Russian troops had been firing artillery across the border and within Ukraine in a major escalation of military support for pro-Moscow rebels since mid-August, a defacto charge that Russia was waging war on its former Soviet neighbour. Moscow, which has thousands of troops close to the Russian side of the border, warned against any attempt to "disrupt" what it said was a purely humanitarian operation; Pentagon press secretary accused Russia of violating Ukraine's sovereignty.
A Chinese fighter jet flew perilously close to a US military aircraft in international airspace this week in a "very dangerous" incident east of China's Hainan Island, the Pentagon said Friday. "On August 19, an armed Chinese fighter jet conducted a dangerous intercept of a US Navy P-8 Poseidon patrol aircraft that was on a routine mission," spokesman Rear Admiral John Kirby told a news conference.