Iran today test-fired an upgraded version of its most advanced missile, capable of hitting Israel and parts of Europe, in a show of strength in its nuclear standoff with the west.

The test stoked tensions between Iran and western powers, with the prime minister, Gordon Brown, saying it showed the need for tougher UN sanctions against Tehran.

“This is a matter of serious concern to the international community and it does make the case for us moving further on sanctions,” Brown said after talks with the UN chief, Ban Ki-moon, in Copenhagen. “We will treat this with the seriousness it deserves.”

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