Get the US guide to the US Marshal's. When India grab the US diplomat, subject him to the same arrest, handcuff, strip search and one night in jail as they subjected Devyani to.
Do not relent. US will posture, but tell them to get lost.
US will refuse to talk INDO-US Nuclear deal. They have delayed it for five years. One additional year delay will not be much in the scheme of things.
If Prime Minister ManMohan Singh is unhappy with non conclusion of the nuclear treaty, so be it.
In a year the US will be back. They need India or China ejects US from the South China Sea.
Let NaMo become the Prime Minister in May next year and let him deal with it.
Did US not deal with Mao Tse Tung in 1971, twenty years after Chinese Killed 29,000 Americans and wounded 400,000.
I guarantee US will posture but will be back.