ATHENS/ISTANBUL (Reuters) – Greece and its euro zone partners engaged in brinkmanship on Monday, with leftist Prime Minister Alexis Tsipras insisting his country would not extend its reform-linked bailout and Germany saying it would get no more money without such a program. European Commission President Jean-Claude Juncker warned Greeks not to expect the euro zone to bow to Tsipras’ demands in a growing confrontation which spooked financial markets and prompted U.S. and Canadian pleas for calm and compromise.