Russia says the US is allowing Daesh to operate “under its nose” in Syria, calling on Washington to explain why terrorists enjoy freedom of movement in a border area where the Americans have a military base, reported Press TV.

The US has declared an expanse stretching 55 kilometers (34 miles) around the al-Tanf area a “de-confliction zone,” only letting in forces allied to Washington and blocking out the Syrian army. Tanf is located in a zone, where Syria, Iraq and Jordan’s borders meet, and is, hence, of paramount strategic importance.

Russia’s Defense Ministry questioned how around 300 Daesh terrorists had been allowed to cross the area under US forces’ watch and move out to block an important road linking the Syrian capital, Damascus, and the northeastern city of Deir Ezzor, Russia’s Sputnik news agency reported on Wednesday.