Israel's ambassador to the U.S., Michael Oren, describes Iran's efforts to make weapons grade nuclear material, escalating the enrichment process from 3.5% to 20%. He says Iran now has 225 pounds of 20% uranium and 11,000 pounds of 3.5%, enough for 5 nuclear bombs, and points out that 20% uranium can be enhanced to weapons grade in weeks. During the initial negotiations the P5+1 nations demanded suspension of enrichment acitivites at a time when the enrichment process was at 3.5%, and transfer of stockpiles abroad. As negotiations dragged on Iran escalated to 20% enrichment. current demands of the P5+1 are for cessation of 20% enrichment and removal of the 20% stockpile, and closing the facility at Qom, as a first step. This has been rejected by Iran. In this op-ed Oren says Israel alerted the world about the Iranian nuclear program 20 years ago, and as this has continued to what it is today, Israel's view is that much of that time was wasted and the window for international efforts to cease and dismantle Iran's nuclear program is almost shut. ...