The United States and South Korea are carrying out their yearly joint military training. North Korea has reacted to the exercises, as in years past, with missile launches. However, a North Korea sympathizer （同情者）in Seoul also carried out an unexpected attack on the U.S. ambassador to South Korea.
The U.S. and South Korea say the joint training is necessary to show military readiness （预备）and resolve（坚决）. But the exercises also increase tensions and the possibility of conflict on the Korean island.
About 10,000 South Korean troops and 8,000 U.S. troops take part in the land, sea and air operations. The soldiers also use computer simulations (模拟)to practice how to answer possible attacks or invasions from North Korea.
North Korea has protested the training. The country's government says the U.S. and South Korea are planning a possible invasion. North Korea has answered with two missile launches.
Daniel Pinkston is a North Korea expert with the International Crisis Group. He agrees the exercises may increase some tensions in the area. But he says they also keep the peace by showing military strength.
He says North Korea uses force as the tool to solve political disagreement inside and outside the country. So, he says, if the government sees weakness it will explore that weakness.
Mr. Pinkston says he is most concerned that North Korean operational commanders may incorrectly understand the purpose of the joint exercises. He says those commanders believe that the United States and South Korea are planning to invade North Korea.
The recent knife attack on the U.S. ambassador did not cause a wider conflict. The ambassador was not seriously hurt and the South Korean attacker is not believed to be connected to North Korea. However, North Korea called the attack a just punishment for the joint military training.
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