Russian authorities say they have detained a suspect in last week’s shooting that wounded a senior military officer, the latest in a series of attacks on personnel and figures linked to the war in Ukraine.

North Korea only shares a 10.5-mile border with Russia, a tiny part of its porous northern border that stretches more than 870 miles and is mostly shared with China. But Pyongyang and Moscow have hailed the bridge’s opening as yet another key moment in their booming ties.