LONDON (Reuters) - Brent oil futures may be trading at $27 per barrel but oil producers are selling their crude in the physical market at lower prices not seen since the aftermath of the Asian financial crisis of the late 1990s.Most are offloading their oil for below $20 a barrel as the coronavirus pandemic savages demand and global supply rises amid a battle between Saudi Arabia and Russia for market share, according to traders, state oil firms, major refiners and prices quoted in physical..