washington president barack obama impose sweep new sanction north korea wednesday intend isolate country leadership recent action pyongyang see washington ally provocative executive order freeze property north korean government unite state prohibit exportation goods unite state north korea also allow u.s. government blacklist individuals whether u.s. citizens deal major sectors north korea economy experts say measure vastly expand u.s. blockade pyongyang north korea conduct nuclear test jan. feb. rocket launch unite state ally say employ ban ballistic missile technology pyongyang say peaceful satellite launch u.s. global community tolerate north korea illicit nuclear ballistic missile activities continue impose cost north korea come compliance international obligations white house spokesman josh earnest say despite decades tensions unite state comprehensive trade ban north korea kind enact myanmar iran americans allow make limit sales north korea although practice trade tiny u.s. officials believe blanket trade ban would ineffective without strong commitment china north korea large trade partner china sign new u.n. sanction early month obstacle remove experts say north korean sanction finally get serious say peter harrell former senior state department official work sanction new sanction threaten ban global financial system anyone even europeans asians business broad swaths pyongyang economy include financial mine transportation sectors so-called secondary sanction compel bank freeze assets anyone break blockade potentially squeeze north korea business tie china myanmar go hard north korea move money anywhere world say harrell center new american security obama slap new sanction north korea test