Renault should sell its 43 percent in Nissan and merge with Fiat Chrysler Automobiles, says Bernstein analyst Max Warburton. In a letter to Renault Chairman Jean-Dominique Senard, Warburton writes that Renault should no longer cling to the idea that its alliance with Nissan can be preserved when all the indications are to the contrary. Below is the full text of the letter: