SEOUL -- The Democratic Peoples Republic of Korea (DPRK) test-fired multiple projectiles believed to be ground-to-ship cruise missiles on Thursday morning into its eastern waters, the Republic of Korea (ROK)'s Joint Chiefs of Staff (JCS) said.The short-range surface-to-ship cruise missiles were launched from the city of Wonsan on the DPRKs east coast in the morning, the JCS said in a statement.The missiles flew about 200 km into its eastern waters. ROK and the United States were jointly analyzing details on the test-launches.The ROK's military strengthened surveillance and vigilance in preparation for additional DPRK provocation, while maintaining the full defense preparedness, the JCS said.