according to the several media reports, china's chief negotiator on north korea's nuclear program says beijing remains opposed to unilateral sanctions against the pyongyang regime taken without the approval of the un security council. quoting chinese foreign ministry news agency ap said wu dawei also told his south korean counterpart in talks on friday that china was "adamantly opposed" to the south's deployment of an advanced us missile defense system that china says poses a threat to its own security. wu also pressed for a resumption of six-nation talks on the north's nuclear programs that have been staled since north korea walked away from them in 2009. the talks involved north and south korea, china, the us, japan and russia. u.s. president barack obama on wednesday imposed sweeping new sanctions on north korea intended to further isolate its leadership after recent actions seen by the united states and its allies as provocative, reports reuters. the financial implications of the new sanctions wil have wide spread impact on north korean economy and threaten to ban from the global financial system anyone who des business with broad swaths of north korea's economy, including its financial, mining and transport sectors.