Israel joined the ranks of Eastern European failing states which delivered their enriched uranium to the US. Over the years, the White House forced them to abandon their nuclear stocks, mostly depleted uranium from power plants.
Since 1960s, Israel refused to deliver her depleted uranium because it would allow the United States to control the size of our nuclear program. Nor is there any sense in expatriating Israeli uranium as we have plenty of space in the desert, and also can use it for weapons. Netanyahu government bowed down to the American pressure.