US Defense Secretary James Mattis landed Thursday in Cairo and met Egyptian President Abdel Fattah el-Sissi and Defense Minister Sedki Sobhy. They discussed various security-related issues including the war on ISIS in Egypt and Cairo's support for Gen. Khalifa Haftar of the Libyan National Army. Russia, Egypt and Qatar have been working together for several months to boost Gen. Haftar who opposes the UN-backed government in Tripoli. For details on the deployment of Russian military units in Egypt near the Libyan border, see DEBKAfile's exclusive report