KIEV (Reuters) - Leaders of mainly Russian-speaking regions of eastern Ukraine that are loyal to President Viktor Yanukovich challenged the legitimacy of the national parliament on Saturday and said they were taking control of their territories. The move appeared to increase the possibility of a split in the sprawling former Soviet republic of 46 million, despite denials by the leaders that this was their intention. The Kiev parliament has passed a series of measures that would reduce the president's powers and pave the way to the formation of a national unity government and early presidential elections. Mikhaylo Dobkin, Governor of...