Oil posted a weekly decline as demand concerns continue to dominate market sentiment even after Saudi Arabia's unilateral pledge to cut production. West Texas Intermediate settled near $70 a barrel, closing out the week lower than where it last stood before Saudi Arabia's surprise weekend announcement. The commodity clocked a 2% weekly decline even with the wild gyrations set off by duelling international headlines. Riyadh's surprise decision to cut output by about 1 million barrels caused a ....