The United States and South Korea will stage about 10 naval exercises in coming months including one starting on Sunday as a deterrent to North Korea.A South Korean defence ministry spokesman today said both sides will continue to conduct joint military exercises- approximately 10 times – in waters surrounding the peninsula for the next several months. He gave no dates but local media said a large-scale anti-submarine drill would be held in early September in the Yellow Sea.The spokesman said the exercise starting on Sunday involves about 20 ships including the 97,000-ton aircraft carrier USS George Washington and some 200 fixed-wing aircraft. About 8,000 army, air force, navy and marine personnel from the two allies will take part, practising anti-submarine warfare, mid-air refuelling and cyber defence among other skills.