As Obama was meeting with Latin American leaders in Colombia this weekend, negotiators from the U.S. and five other world powers were in Turkey for a fresh round of nuclear talks with Iran.

While previous talks have done little to dissuade Iran from moving forward on its nuclear program, diplomats called the latest negotiations constructive and useful. Both sides agreed to hold more talks in Baghdad at the end of May.

The Israeli prime minister balked at the announcement of more talks, saying the intervening five weeks would simply give Iran more time to continue enriching uranium without restrictions. Netanyahu has said Iran uses diplomatic negotiations as a diversion while it continues to pursue a nuclear weapon.

Israel has raised the prospect of a preemptive military strike on Iran's nuclear facilities. The Obama administration has urgently sought to hold off Israeli military action, which would likely result in the U.S.