Because Russia has been so truthful about, well, anything and everything they do? No, it's about a nuclear weapon they've been developing and the "nuclear react

Because Russia has been so truthful about, well, anything and everything they do? No, it's about a nuclear weapon they've been developing and the "nuclear reactor" bit is just a ruse to confuse people who haven't generally been paying attention to Russia developing new kinds of delivery systems for their nuclear warheads.