The military bloc should have been dissolved after the collapse of the Soviet Union, the US economist has argued NATO has outlived its purpose and should have been dissolved decades ago, prominent American economist and Columbia University professor Jeffrey Sachs has said.  Speaking to RIA Novosti on Sunday, Sachs argued that NATO was initially formed for the sole purpose of countering the USSR and should have been disbanded in 1990 when Soviet President Mikhail Gorbachev dissolved the Warsaw