North Korea has fired two short-range ballistic missiles into the sea as tension with Seoul and Washington continues to mount. <br /><br /> This after the north claimed it had miniature nuclear warheads to place on its missiles and was ready to carry out nuclear strikes.<br /><br /> Angry over joint military exercises underway between the US and South Korea, Pyongyang has also announced it is cancelling all commercial exchange projects with the south.<br /><br /> Cho June-Hyuck, a South Korean Foreign Ministry spokesman, said: “Our government, through our delegation at the UN, is discussing diplomatic response measures with our allies. <br /><br /> “And we plan to take various necessary measures including sending a letter to the chairman of the North Korea Sanctions Committee of the Security Council.”<br /><br /> Japan has also lodged an official protest at the North Korean embassy in Beijing.<br /><br /> The north is facing tough new sanctions after a fourth nuclear test and the test-firing of long-range missiles. <br /><br /> Pyongyang says it will als
