seoul south korea warn north korea wednesday unite state ally work sanction inflict bone-numbing pain late nuclear test urge china part rein isolate neighbor tension high border north fourth nuclear test wednesday last week south korean force fire shots toward yonhap news agency say suspect north korean drone return north shots south korean military officials tell reuters north nuclear test anger china unite state raise question do stop development nuclear weapons world economic forum withdraw invitation north korea foreign minister attend annual davos meet nuclear test country first participation event 18 years u.s. house representatives vote nearly unanimously tuesday pass legislation broaden sanction north apparently unperturbed prospect international isolation north korean leader kim jong un call expansion size power country nuclear arsenal urge detonation powerful h-bombs north state media report north korea say last week test powerful hydrogen bomb unite state various experts doubt blast roughly size previous test atomic bomb 2013. south korean president park geun-hye say provocations north include cyber-terrorism possible new sanction tough previous ones give specifics cooperate closely unite state ally come effective sanction make north korea feel bone-numbing pain security council also bilaterally multilaterally say speech park say south korea china discuss u.n. security council resolution north korea note china state repeatedly would tolerate nuclear program china north korea main ally trade partner oppose bomb beijing tie south korea grow close recent years certain china well aware strong follow necessary step able stop north fifth sixth nuclear test guarantee true peace stability park say believe chinese government allow situation korean peninsula deteriorate further sing kim u.s. special representative north korea policy meet south korean japanese counterparts seoul wednesday say three agree meaningful new sanction resolution need security council hope chinese authorities agree us simply take business usual approach late provocation work closely come meaningful resolution say washington white house deputy national security adviser ben rhodes say china could put pressure north korea understand concern instability korean peninsula fact matter current status quo destabilize nuclear test tell news brief rhodes say important unite state ally develop capabilities respond refer sunday u.s. b-52 bomber flight south korea missile defense military cooperation south korea japan rhodes also say president barack obama choose mention north korea state union address tuesday want give kim jong un attention like attention probably would like nothing president spend lot time talk state union rhodes say particularly feel compel give attention china reject complaints enough north korea beijing foreign ministry spokesman hong lei say china efforts toward denuclearised korean peninsula would continue everyone interest everyone responsibility include china south korea say u.s. house sanction measure pass 418-2 senate leaders expect consider similar bill shortly house bill introduce 2015 bring vote north korea late test bill use target financial pressure isolate kim jong un top officials assets maintain foreign bank hard currency sustain rule say republican representative ed royce chairman house foreign affairs committee author measure become law must also pass u.s. senate sign obama 28,500 u.s. troop south korea put high alert noisy propaganda battle play across heavily fortify border north south korea still technically war north since 1950-53 conflict end truce treaty days blare propaganda loudspeakers across border south korea military say find anti-south leaflets seoul area suspect drop north korean hot air balloon south korean financial regulators meet computer security officials 16 bank financial institutions urge vigilance face possible cyberattacks north korea although none detect south korea call 'bone-numbing sanction north nuclear test