Clinton's visit will bring something

Mrs. Clinton hasn't only come to India for making US and India's relationship strong but also to make sure that India and Pakistan don't fight this will be a successful tour and she will be half able to solve some crisis between India and Pakistan.

North Korea will compromise

Yes North Korea will compromise and halt its nuclear weapon plan within three years and there are reasons for it.
1.Due to overcome its status as poor nation financially.
2.Due to fear of people who might protest.
3.Due to continual pressure of China with whom they don't want to quarrel.

US has no power to stop Iran

How much Hilarry Clinton or President Obama will try but they won't be able to stop Iran from developing nuclear. In later years this will be one of the reason for the ignition of religious war as this will take a new tale in Muslim vs USA.