(ANSA-AFP) - ROME, JUL 11 - Defence Minister Guido Crosetto signed a letter of intent with his counterparts from France, Germany and Poland on the sidelines of the NATO summit in Washington, ANSA sources said Thursday. The letter regards the so-called Elsa (European Long-Range Strike Approach) plan aimed at "improving our capability, as Europeans, to develop, produce and deliver capabilities in the field of long-range strikes, which are sorely needed to deter and defend our continent" ANSA has learned. (ANSA-AFP).