We've taken a critical, significant step forward towards reaching a verifiable resolution that prevents Iran from obtaining a nuclear weapon.
On January 20, in just a few short days, we will begin implementation of the Joint Plan of Action that we and our partners agreed to with Iran in Geneva.
As of that day, for the first time in almost a decade, Iran's nuclear program will not be able to advance, and parts of it will be rolled back, while we start negotiating a comprehensive agreement to address the international community's concerns about Iran's program.
Because of the determined and focused work of our diplomats and technical experts, we now have a set of technical understandings for how the parties will fulfill the commitments made at the negotiating table. These understandings outline how the first step agreement will be implemented and verified, as well as the timing of implementation of its provisions.
Iran will voluntarily take immediate and important steps between now and January 20 to halt the progress of its nuclear program. Iran will also continue to take steps throughout the six months to live up to its commitments, such as rendering the entire stockpile of its 20% enriched uranium unusable for further enrichment. As this agreement takes effect, we will be extraordinarily vigilant in our verification and monitoring of Iran's actions, an effort that will be led by the International Atomic Energy Agency.
The United States and the rest of our P5+1 partners will also take steps, in response to Iran fulfilling its commitments, to begin providing some limited and targeted relief. The $4.2 billion in restricted Iranian assets that Iran will gain access to as part of the agreement will be released in regular installments throughout the six months. The final installment will not be available to Iran until the very last day.
While implementation is an important step, the next phase poses a far greater challenge: negotiating a comprehensive agreement that resolves outstanding concerns about the peaceful nature of Iran's nuclear program.
As the United States has made clear many times, our absolute top priority in these negotiations is preventing Iran from obtaining a nuclear weapon. We have been clear that diplomacy is our preferred path because other options carry much greater costs and risks and are less likely to provide a lasting solution.
We now have an obligation to give our diplomats and experts every chance to succeed in these difficult negotiations. I very much appreciate Congress' critical role in imposing the sanctions that brought Iran to the table, but I feel just as strongly that now is not the time to impose additional sanctions that could threaten the entire negotiating process. Now is not the time for politics. Now is the time for statesmanship, for the good of our country, the region, and the world.
We are clear-eyed about the even greater challenges we all face in negotiating a comprehensive agreement. These negotiations will be very difficult, but they represent the best chance we have to resolve this critical national security issue peacefully, and durably.