By Humeyra Pamuk NADI, Fiji (Reuters) – China is seeking to establish military relationships in the Pacific, a senior U.S. administration official said on Saturday, as Washington promised more diplomatic and security resources for the region, including an embassy in the Solomon Islands. Secretary of State Antony Blinken will announce plans for the embassy in the Solomon Islands, which switched its diplomatic allegiance to China from Taiwan in 2019, while on a visit to Fiji where he will host a virtual summit with 18 Pacific leaders, a state department official said. Blinken flew to Fiji after …