VIENNA - Iran and six world powers will try in talks in Vienna this week to narrow differences and keep alive hopes of ending a decade-old nuclear dispute by late July, despite doubts the self-imposed deadline can be met.

On the sidelines of the five-day meeting in the Austrian capital, the fast-moving crisis in Iraq could also require the attention of US and Iranian diplomats. The two countries share concern over the ascendancy of militant Sunni rebels there.

With time running short if a risky extension of the nuclear talks is to be avoided, negotiators face huge challenges to bridge gaps in positions over the future scope of Iran's nuclear program in just five weeks.

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