North Korea’s recent missile launch may be a test of upgraded exports to Russia, observers say, as the war in Ukraine gives Pyongyang opportunities to improve its weapons. At about 6am on Wednesday, South Korea’s Joint Chiefs of Staff (JCS) detected a missile launched from the North’s southeastern port city of Wonsan. It flew roughly 700km (435 miles) eastward before falling into the Sea of Japan. The JCS conspicuously did not specify the missile’s launch angle or whether it should be classified...