A South Korean court sentenced former president Yoon Suk-yeol to two years in prison on Monday after finding him guilty of illegally receiving opinion polling services worth 270 million won (US$179,800) for free from a political broker, local media said.The Seoul Central District Court found Yoon violated political funding laws by receiving 14 rounds of polling from the political broker at no cost and later exercising influence over the nomination of a former lawmaker to repay him,...