Iran’s nuclear energy agency says the country has broken limits set in its 2015 nuclear deal with world powers. The agency reported on Monday that Iran began enriching uranium to 4.5 percent, passing the 3.67 percent limit set under the deal. The international agreement was meant to restrain the country’s nuclear activities. The higher level of uranium enrichment is the second time Iran has violated the agreement. Last week, Iran said it had produced more than 300 kilograms of low-enriched uranium and announced plans to continue making more. Uranium enriched to 5 percent is reported to be enough to produce fuel for a nuclear energy center. However, it is far below the purity needed to make a nuclear weapon. For such weapons, a purity level of about 90 percent is required. In recent weeks, Iran said several times that it would surpass limits set by the Joint Comprehensive Plan of Action. Iran’s government is trying to pressure other countries, especially those in Europe which signed the agreement, to do more to help Iran economically. The United States, China and Russia also signed the 2015 Iran nuclear deal.