Australian: RUSSIA triggered a fresh scramble for the oil wealth of the Arctic yesterday when President Dmitry Medvedev called on his security chiefs to establish a border in the region. Mr Medvedev laid claim to a vast tranche of the Arctic, telling the Russian National Security Council the area was of great strategic importance. The US Geological Survey estimates the region contains 90 billion barrels of oil, as well as gas reserves — all increasingly accessible as global warming …