Russia will move its tactical nuclear weapons close to the western borders of Belarus, the Russian envoy to Minsk said, placing them at NATO’s threshold in a move likely to further escalate Moscow’s standoff with the West. The two Slav neighbors are formally part of a “union state” and have been in talks for years to integrate further, a process that has accelerated after Minsk allowed Moscow to use Belarusian territory to send troops into Ukraine last year.