Syria crisis: Russia and US military to hold talks on air strikes
The US and Russian military will hold talks "as soon as possible" to avoid clashing in Syria, the countries' top diplomats say.
Russian defence officials say their aircraft carried out about 20 missions against the so-called Islamic State group (IS) on Wednesday, according to the BBC.
But the US expressed fears the targets were non-IS opponents of Russia's ally, Syrian President Bashar al-Assad.
The US is targeting IS with air strikes in both Syria and Iraq.
Nato said there had been little co-ordination by Russia with US-led forces against IS, also known as Isil. The US says it was informed of Wednesday's air strikes only an hour before they took place.
The New York Times and the Wall Street Journal report that US-backed rebels were targeted by Russia.