Baku, July 5, AZERTAC Crude oil could collapse to $65 a barrel by the end of this year and slump to $45 by end-2023 if a demand-crippling recession hits, Citigroup Inc. has warned, according to Bloomberg.That outlook is based on an absence of any intervention by OPEC+ producers and a decline in oil investments, analysts including Francesco Martoccia and Ed Morse said in a report. Brent, the global crude benchmark, last traded near $113 a barrel.