By Gabriela Baczynska and Alissa de Carbonnel KIEV (Reuters) – U.S. Senator John McCain met Ukrainian opposition leaders in Kiev on Saturday and voiced support for protesters camped out for weeks in the capital, a move sure to anger Moscow for what it sees as Western meddling in its backyard. The street protests started after the November 21 decision by President Viktor Yanukovich – seeking the best possible deal for Ukraine to stave off bankruptcy – to walk away from a trade pact with Europe at the last minute and seek closer ties with its old Soviet master. McCain was due to be joined by the chairman of the Senate's Europe subcommittee, Chris Murphy, on Sunday. "I am proud of the people of Ukraine and their steadfast efforts for democracy," McCain told reporters after meeting the country's Foreign Minister Leonid Kozhara.