The Pentagon has revealed its intention to maintain troops in Syria after the defeat of the militant group ISIS, despite calls from the country and its Russian and Iranian allies to expel US forces, whose presence they consider illegal.
For years, both the US UU like Russia they have sponsored anti-ISIS campaigns that compete separately in Syria. While Moscow and its allies – which included Syrian President Bashar al-Assad and Iran – reestablished government control over the majority of Syria, they increasingly questioned the continuing role of Washington, which was also directly involved in protracted conflicts in Afghanistan and Iraq. . . The United States, which once supported rebels trying to topple al-Assad and then focused on Kurdish militias fighting ISIS, said their current presence was necessary while the threat of a resurgent ISIS and other militant Islamist groups stay.
Related: Syria and Russia say that ISIS is dead, now the United States should leave
"Let's keep our commitment on the ground as long as we have to support our partners and prevent the return of terrorist groups, "Pentagon spokesman Eric Pahon told Agence France-Presse.
"To ensure a lasting defeat of ISIS, the coalition must ensure that it can not regenerate, recover lost ground, or plan external attacks," he added. 
Pahon went on to say that the United States finally withdrew from Syria, where it began to fund the insurgents at least in 2012 and bombed ISIS in 2014, it would be "based on conditions" and refused to offer any timeline or other details about what those conditions might be. It is believed that the United States deployed about 1,723 soldiers in Syria, compared to 1,251 reported in June.
These troops have helped the Syrian Democratic Forces – a largely Kurdish coalition of Arabs and ethnic minorities – to fight against ISIS and seek to establish greater Kurdish autonomy in the north. While the US-backed campaign to overthrow ISIS from its de facto capital of Raqqa was approaching the parallel offensive of Syrian troops and their Russian and Iranian allies against militants in central Syria, tensions between the two factions increased. drastically
The leading coalition declared victory in Raqqa in October and, the following month, Russia and its allies announced that they had successfully retaken the eastern city of Deir Ezzor. More gains against ISIS by the Syrian Democratic Forces and the armies of Syria and Iraq have left the remnants of the group, which once covered half of both countries, relegated to an increasingly smaller pocket between the two countries.
Shortly after Syria and Iraqi troops gathered at the border after years of insurgent and jihadist control. The Syrian Ministry of Defense described the presence of the United States and other foreign armed forces not deployed with the consent of the government as "an act of aggression and an attack on the sovereignty of the Syrian Arab Republic." as well as a serious violation of the statutes and principles of the United Nations, "and called for its" immediate and unconditional withdrawal. "
With ISIS thinking it is in its final stage, Russia has taken a leading role in intermediating the peace talks in cooperation with Iran, which supported the Assad Shiites Muslim militias and Turkey, which mainly supported fighters from the Sunni Muslim opposition, opposed both the presence of ISIS and Kurdish autonomy. Like Syria and Iran, Russia has disputed the legitimacy and legality of the US mission in Syria, a question raised by Special Forces commander Raymond Thomas earlier this year. Russia accused the US-led coalition of supporting "terrorism" and "extremist groups" during the six-year conflict, while the United States accused Russia of killing a large number of civilians in its bombing campaign.
However, as the end of ISIS The pocket was squeezed from several sides, Russia joined the United States to support the fighters of the Kurdish People's Protection Units (YPG) that fight ISIS north of the Syrian military front in Deir Ezzor, Deutsche Welle reported on Sunday. Just days before, the YPG was not sure of its own relationship with the Pentagon when Defense Secretary James Mattis revealed on Friday that he was "changing the composition of our forces" with the collapse of ISIS and that he would stop putting together the YPG, according to Associated Press.
In recent days, US and Russian warplanes conducted air strikes against IS targets in eastern Syria and the post-war reconciliation working group announced on Monday that the Kurds would provide security to Russian forces and officials Syrians who work with local communities in the devastated region, according to the state news agency Tass Russian.