beijing china air force conduct island encirclement patrol near taiwan military say tuesday senior chinese diplomat threaten china would invade self-ruled island u.s. warships make port visit china consider taiwan wayward province never renounce use force bring control numerous chinese fighter jet bombers surveillance aircraft conduct routine plan distant sea patrol monday safeguard national sovereignty territorial integrity air force spokesman shen jinke say military branch microblog h-6k bombers su-30 j-11 fighter jet surveillance alert refuel aircraft fly miyako strait japan south bashi channel taiwan philippines test real combat capabilities shen say taiwan defence minister feng shih-kuan say statement dispatch aircraft ship monitor activity chinese military drill unusual people alarm china conduct numerous similar patrol near taiwan year say practice normalize press ahead military modernization program include build aircraft carriers stealth fighters give ability project power far shore beijing regularly call taiwan sensitive important issue unite state taiwan well arm mostly u.s. weaponry press washington sell high-tech equipment good deter china september u.s. congress pass national defense authorization act 2018 fiscal year authorize mutual visit navy vessels taiwan unite state prompt senior u.s.-based chinese diplomat say last week china would invade taiwan instant u.s. navy vessel visit taiwan china suspect taiwan president tsai ing-wen lead independence-leaning democratic progressive party want declare island formal independence tsai say want maintain peace china defend taiwan security china conduct 'island encirclement patrol near taiwan