dakar dec 10 reuters  the international monetary fund executive board on friday said it had approved a threeyear extended credit facility worth 570 million to help meet the central african countrys balanceofpayments and budget needs the decision allows the imf to immediately disburse 7828 million the lender said in a statement the combined shocks of the covid19 pandemic the volatility in oil prices the heightened insecurity and a looming food crisis due to climate change have severely stressed chads already vulnerable economy said kenji okamura the imf boards deputy managing director the macroeconomic outlook has further deteriorated with greater macroeconomic weaknesses than previously envisaged as well as more acute liquidity needs as a result chads public debt has become unsustainable reporting by aaron ross writing by hereward holland editing by jonathan oatis