The US has cautioned against expecting any breakthrough 'anytime soon' on the UN Security Council reforms, dampening India's hopes for a permanent seat just a week after President Barack Obama backed its quest for this prestigious slot.

A top US official also clarified that Obama's endorsement of India for permanent membership in the UNSC during his visit to New Delhi was not a last minute decision, but had been well thought out. It was kept hush-hush, since the endorsement was a big news item, he said.