Iran has signed a deal to sell Iraq arms and ammunition worth $195 million, according to documents seen by Reuters — a move that will break a U.N. embargo on weapons sales by Tehran.

The agreement was reached at the end of November, the documents showed, just weeks after Iraqi Prime Minister Nouri al-Maliki returned from lobbying the Obama administration in Washington for extra weapons to fight al-Qaida-linked militants.

Some in Washington are nervous about providing sensitive U.S. military equipment to a country they worry is becoming too close to Iran. Several Iraqi lawmakers said al-Maliki made the deal because he is fed up with delays in U.S. arms deliveries.