By Sakura Murakami (Reuters) -Japan said on Friday it would prepare to ship Patriot air defence missiles to the United States after revising its arms export guidelines earlier that day, in the pacifist nation’s first major overhaul of such export curbs in nine years. The announcement comes as Japan, which had long adopted a stance of not allowing exports of deadly weapons, seeks to boost its defence industry amid an increasingly tense security environment in the Indo-Pacific. “This holds significant meaning in terms of further strengthening the Japan-U.S. alliance. It will contribute not only …