South Korea’s military says its soldiers fired warning shots at about two dozen North Korean troops who crossed the heavily fortified Demilitarized Zone separating the two countries. It was the second reported border incursion this month and came as Russian President Vladimir Putin departed for a state visit to Pyongyang, where he’s set to meet North Korean leader Kim Jong-un to discuss trade, weapons sales and military assistance. It’s Putin’s first visit to North Korea since 2000.