U.S. stock futures and the euro tumbled in early Asian trade on Tuesday after talks between Greece and euro zone finance ministers broke down when Athens rejected a proposal to request a six-month extension of its international bailout program. U.S. stock futures fell to (ESc1) $2,082, about 0.8 percent below its levels on Monday just before the news of euro zone finance ministers’ meeting hit the wire. Australian shares slumped 0.6 percent (.AXJO), dragging down MSCI’s broadest index of Asia-Pacific shares outside Japan 0.2 percent.