PARIS (Reuters) - French Prime Minister Manuel Valls said on Tuesday that he hoped ongoing euro zone finance ministers' talks on proposals to end the Greek debt crisis would be "fruitful." "We continue to think that an agreement is possible," Valls said at a press conference with his Chinese counterpart. "Greece's government has indeed sent a letter this afternoon in which it formulates proposals. These proposals are currently being studied in Brussels and a Eurogroup is currently in session. ...