Repsol (REPYY.PK) warns that it will sue any companies that invest in YPF (YPF -4%) following Argentina's nationalization last week. The government has approached Petrobras and intends to contact the likes of Exxon (XOM), Chevron (CVX) and ConocoPhilips (COP), although why they'd want to go anywhere near Argentina is another question.
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