The Northern Fleet has also received attention with respect to technological upgrades. The Fleet has received new combat aircraft (deployed within the 45th Air and Air Defence Army), enhanced shore-based missile assets (both surface-to-surface and surface-to-air) as well as new systems such as the Samarkand electronic warfare systems in 2017. Samarkand is designed to assess electromagnetic situation, search, detect and analyze radio emissions. Russia's Northern Fleet in 2018 resumed regular air patrols of the Arctic by long-range anti-submarine aircraft and its share of modern samples of weapons and equipment exceeded 56 percent. An air defense regiment of the Northern fleet armed with S-400 SAM launchers went on combat duty in Novaya Zemlya in the September 2019.