By Hyonhee Shin SEOUL (Reuters) – North Korean leader Kim Jong Un has kicked off a key meeting of the country’s ruling party, state media KCNA reported on Wednesday, setting the stage for unveiling policy decisions for the new year. The ninth Plenary Meeting of the 8th Central Committee of the Workers’ Party of Korea wraps up a year during which the isolated country enshrined nuclear policy in its constitution, successfully launched a spy satellite and fired a new intercontinental ballistic missile (ICBM). The days-long assembly of the party and government officials has been used in recent yea…