Yesterday, November 23rd, North Korea fired scores of artillery shells at the South Korean island of Yeonpyeong, killing at least four (two soldiers, two civilians), wounding 18 more, destroying several houses, and setting numerous fires in one of the most serious clashes between the two countries in decades. North Korea claimed it was a response to earlier shells fired by South Korea - which the South acknowledged had been fired, but as an exercise, and not into North Korean territory. 70,000 South Korean troops were beginning an annual nationwide military drill called "Safeguarding the Nation" in the area, near the spot where a South Korean naval vessel was sunk in March, killing 46 sailors - which Seoul also blamed on North Korea. This attack coupled with recent revelations about the North's nuclear capabilities and escalating threats and counter-threats have raised tensions around the region - even as athletes from both Koreas continue to compete on a world stage, against each other and other nations, in the Asian Games in China.