KIEV (Reuters) - Ukrainian President Viktor Yanukovich's party was on course on Monday to secure a parliamentary majority after an election, but will face an opposition boosted by resurgent nationalists and a liberal party led by boxing champion Vitaly Klitschko. Victory for the ruling Party of the Regions in Sunday's vote will cement the leadership of Yanukovich, who faces re-election in 2015 and whose rule has been marked by an accumulation of presidential powers and antagonism with the West over the imprisonment of his rival, opposition leader Yulia Tymoshenko. ...