Question

which nations ongoing efforts to develop nuclear weapons in the early 21st century has caused international concern

Answer 1

North Korea was the nation that caused international concern due to efforts to develop nuclear weapons in the 21st century.

What motivated the arms race in North Korea?

The dictatorial country has as its central motives in the development of the arms race the state of alert for invasions, instituted since the Korean War.

Therefore, other factors of the nuclear tests in North Korea are demonstrative of the technological development of the country and of the legitimacy of its leaders in the development of weapons.

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