Russian military officials have discussed how and under what conditions Russia would use a tactical nuclear weapon in Ukraine. That’s according to new intel described by multiple sources. Some U.S. officials have heightened concern that Russia could use nuclear weapons in Ukraine. That's following an assessment from the National Intelligence Council. It suggests Russia's military leaders have been discussing what might prompt such a strike according to multiple people who've read it. But the analysis is not raw intelligence or a high-confidence product.