Britain, France, and Germany have warned the UN they will reinstate sanctions on Iran if no diplomatic deal is reached over Tehran’s nuclear program by the end of August. In a joint letter, the E3 said they are ready to use the 2015 deal’s “snapback mechanism” if Iran continues violating limits, accusing Tehran of stockpiling 40 times the permitted uranium. The warning follows Israeli and US strikes on Iranian nuclear sites and Iran’s suspension of cooperation with the IAEA.