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U.S. President Barack Obama said Tuesday that his administration will work on “a system of signficatives sanctions” against Iran in the coming weeks.

Obama said that Iran had refused to accept an agreement uranium processing the UN, which is, according to him, “the most obvious attempt” by the international community to cooperate with Tehran.

He said that because of Tehran’s refusal to commit, the next step is to move to sanctions.

He accused Iran of pursuing “a path leading to the militarization, stressing that what is unacceptable not only to the United States, but also for the international community

“What we’re going to work in the coming weeks is to develop a system of sanctions siginficatives” said President Obama.

He said his administration will address a variety of ways in which countries report on Iran that its approach is unacceptable, and that the UN will be one aspect of this broader effort.

He expressed confidence that the international community is united around the bad behavior of Iran, to more pressure on Tehran.

Obama made the remarks during an unexpected appearance in the press room of the White House, where spokesman Robert Gibbs was supposed to hold a regular press briefing.

Iran began Tuesday uranium enrichment to 20%.

An agreement brokered by the International Atomic Energy Agency Nuclear Safety of the UN, provides shipment by Iran of its core low-enriched uranium to Russia and France, where it is processed into fuel rods with a purity of 20 percent.

Iran is the center of an international controversy over its nuclear program. The United States and its Western allies accuse Iran of secretly developing atomic weapons under cover of a civilian program. Iran denies the charge and says its nuclear program is only used for peaceful purposes.