By Eman Abouhassira, Jana Choukeir and Jonathan Saul DUBAI/LONDON, June 26 (Reuters) - Iran reasserted its right on Friday to control shipping in the Strait of Hormuz and warned Gulf states against siding with the U.S., a day after an attack on a ship near Oman highlighted the fragility of a preliminary deal to end the Iran war. Tehran was responding to what it called an "interventionist, irresponsible and provocative" joint statement by the U.S. and six Gulf states that rejected Iran's insistence that it could charge tolls on vessels transiting the strait.