BBC News reports the fight against so-called Islamic State (IS) will dominate talks in Washington shortly as French President Francois Hollande meets US President Barack Obama.The Paris suicide attacks claimed by IS have prompted the US to issue a worldwide travel alert to its citizens. President Hollande is meeting other world leaders this week, hoping to forge a stronger alliance against IS. But Turkey's downing of a Russian jet has fueled tension over the Syria war. As Turkey is a NATO member the incident has put a new strain on Russian-Western efforts to neutralize the IS threat in Syria and Iraq. The US is unlikely to support French efforts to build a Russian-Western military alliance against IS, correspondents say. But there is some military co-ordination with Russia.