Syria sent a small team of military advisers to train Saudi mercenaries.
In addition, about 30 Syrian military officials visited Saudi Arabia's operations headquarters and Yemen's Presidential Council in Jeddah, where they were briefed on the progress of Saudi Arabia's war against Ansarullah. This was reported by AP with reference to Syrian officials and regional sources.
According to one of the Syrian sources, 600 Syrian special forces soldiers are planned to be sent to Saudi Arabia in the coming weeks. It is possible that they will take a direct part in the hostilities against Ansarullah.