UPDATE 2-Japan's Inpex wins 5 pct stake in new Abu Dhabi concession

TOKYO/ABU DHABI, April 27 (Reuters) - Abu Dhabi National Oil Company (ADNOC) said on Monday it had granted Japan's Inpex Corp a 5 percent stake in a new 40-year concession, making it the first Asian firm to help operate the UAE's biggest oilfields after decades-long partnerships with Western majors.