The US is said to have agreed for the safe transfer of terrorists from Iraq to Eastern Syria on the premise ISIS militants fight Russian troops when they get there, a news agency has claimed.

The agreement is said to involve 9,000 extremists who will leave Mosul for eastern areas of the country to capture the cities of Dier ez-Zouer and Palmyra.

Its purpose, it is claimed by Russian news agency RIA Novosti, is that the White House hopes the ISIS militants will fight Russian troops in war-torn Syria.

ISIS fighters will be allowed to flee Mosul and retreat to Syria under an agreement made with the US, Russia has claimed

The news agency reported that America and Saudi Arabia had come to an agreement to create a peaceful passage for ISIS fighters to leave Mosul for Syria before Iraqi government security forces begin their liberation of the city, according toIraqi News.

'The United States and Saudi Arabia reached the agreement to provide safe havens for the ISIS militants and their families before Iraqi government security forces storm into the city of Mosul,' RIA Novosti said.

The Russian news agency added: 'The international coalition air force will conduct a number of air strikes on several buildings that were previously agreed on with the militants.

Secretary General of Hezbollah Hassan Nasrallah yesterday accused The White House of trying to mobilize ISIS in the eastern region of Syria.

According to the anonymous diplomatic source, President Barack Obama has already sanctioned an operation to liberate Mosul, due to take place this month.

ISIS captured Mosul - the biggest city in northern Iraq and a key oil centre - in June 2014 but its hold on the area has grown weaker in recent weeks as the Iraqi army and Kurdish forces attack from opposite directions.