Dynamiting inter-Korea roads and railways. Threatening war over drone incursions. Moving nuclear-capable weapons to the border. North Korea appears very unhappy with the South at the moment -- but why ...
In May, Russian President Vladimir Putin ordered his forces to rehearse deploying tactical nuclear weapons in response to what he alleges are "threats" from the West in response to the war in Ukraine.
Ukrainian intelligence believes that North Korea is sending thousands of its own soldiers to fight for Russia against Ukraine, a source tells NBC News.