As the West seeks to find a solution to the crisis in Syria, the US Secretary of State, John Kerry has arrived in Moscow for talks to try to bridge gaps with Russia.
He is due to have meetings with President Vladimir Putin and Foreign Minister, Sergei Lavrov on Monday.
The US and Russia have long disagreed on what role Syrian President, Bashar Al-Assad should play in the process.
The US wants Mr Assad to stand down but the Kremlin believes that decision lies with the Syrian people.
As the meeting with Mr Lavrov began, Mr Kerry said: “The world benefits when powerful nations can find common ground and I hope today, we can find some common ground.”
On Islamic State, he said Russia and the US both agreed it was “a threat to every country, these are the worst of terrorists, they leave no choice but for civilised nations to join together and push them back and destroy them”.
Mr Kerry will try to prepare the ground for an international meeting on Syria mooted for later this week. Mr Lavrov said the Islamic State (ISIS) issue was not limited to Syria, as the group was also active in Iraq, Afghanistan and Yemen.
He also said that the meeting would cover the matter of Ukraine, with its continued division between the Western-backed government in Kiev and the Russian-backed separatists in its East.
Russia has been carrying out air strikes targeting ISIS positions in Syria, but the US accuses Russia of bombing moderate rebels.