By Andrea Shalal WASHINGTON (Reuters) – The United States told allies in NATO and several Asian countries on Monday that China had signaled willingness to provide military and economic aid to Russia, at Moscow’s request, to support its war in Ukraine, a U.S. official said as top U.S. and Chinese officials met in Rome. The message, sent in a diplomatic cable and delivered in person by intelligence officials, also said China was expected to deny those plans, according to the official, who spoke on condition of anonymity. U.S. national security adviser Jake Sullivan was meeting with China’s top d…