Iran denies negotiations with U.S.

Iran says it is reviewing a U.S. ceasefire proposal but firmly denies President Trump's claims that talks are underway with Tehran desperate to strike a deal. Stocks fall and oil rises as investors reassess the odds of a ceasefire with former Goldman Sachs CEO Lloyd Blankfein telling CNBC investors should tread carefully. G7 foreign ministers arrive for a key summit in France, as conflicts in the Middle East and Ukraine dominate the agenda. NATO's Supreme Allied Commander for Transformation tells CNBC the military alliance is confronting new forms of warfare and urges Europe to take on a greater leadership role.

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