* MSCI Asia ex-Japan falls, Nikkei opens down 1.2 pct. * Greece clinches austerity approval, euro stays pressured. Asian shares fell on Thursday as investors worried about the fiscal crisis in the United States and the European economy's further deterioration, underpinning safe-haven currencies such as the yen and dollar. President Barack Obama had little time to savor victory on Wednesday before he fac es a looming fiscal showdown and a still-divided Congress able to block his every move. MSCI's broadest index of Asia-Pacific shares outside Japan eased 0.3 percent, retreating from a near eight-month high on ... (full story)