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As weapon systems move and advance, as new countries develop these capabilities, there is real risk that there is a reduction in strategic stability just staying right we are today so that it -- the reason that we're asking for other countries to participate -- and Foreign Minister Sergei Lavrov suggested France and the United Kingdom join as well, happy to consider that too, the cumulative mission set has to be global strategic stability, and we will continue to engage in conversations with the Russians and others with the aim of achieving that.