ISTANBUL A Hong Kong court sentenced former media tycoon Jimmy Lai to 20 years in prison Monday on charges of violating the National Security Act, state media reported. The High Court of Hong Kong last December found Lai guilty on all three counts, including two charges of "conspiring to collude with foreign forces" and a charge of conspiracy to publish seditious materials, Xinhua News Agency reported. A mitigation hearing for Lai's case began on Jan. 12 and concluded on Jan. 13. The defendants