自特朗普去年重返白宫以来，笼罩在美伊谈判桌上的核心议题——伊朗未来铀浓缩活动的前景——至今悬而未决。据官员透露，美方最初要求伊朗永久终止铀浓缩计划，但上周立场出现松动，首次表态可接受伊朗暂停该计划20年的方案。对特朗普而言，若将暂停年限进一步缩短，将使新协议与其长期抨击的2015年伊核协议过于相似。该历史性协议曾规定伊朗在15年内不得生产丰度超过3.67%的浓缩铀。
然而，接近谈判的消息人士指出，近日各方在此问题上展现出一定灵活性。德黑兰方面正试探华盛顿是否同意其在10年后开展部分铀浓缩相关活动。调停方考虑的一项折中方案显示，伊朗可能先暂停铀浓缩十年，随后获准在至少另外十年内生产少量低浓铀。
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