The deployment of a nuclear submarine in the Korean theater is part of the so-called "Washington Declaration," which aims to deter the North from attacking its neighbors. Over the last several months, there's been increased anxiety over Pyongyang's ballistic missile tests, and, as a result, the US and South Korea have taken measures to deter further acts of aggression.
There is widespread criticism of the US deployment of a nuclear submarine in South Korea. The deployment threatens to make the region more dangerous, as it provides a means for the US to retaliate against the North if it launches a nuclear attack on the South. It would do no good for either country to strike back against the other if an unthinkable event were taking place.
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