This is reported by the Institute for the Study of War.Ukrainian open-source intelligence group Frontelligence Insight says satellite images from July 7 reveal major changes at the Khalino airbase in the Kursk region. Around 10 fortified soil-covered bunkers, 12 uncovered concrete bunkers, and eight hangar buildings were built on the aprons.Planet Labs images from June 27 confirm this, showing fortified hangars at the same airbase.Similar activity was spotted at the Saky airbase in occupied Crimea. Images from July 9 show two concrete bunkers under construction, and Planet Labs images from July 7 show concrete shelters for aircraft.Frontelligence reported no construction work at the Dzhankoy base in occupied Crimea.Satellite images from July 9 show wreckage from destroyed aircraft still present at the Belaya airbase in the Irkutsk region and the Olenya airbase in the Murmansk region following Operation Spider Web.Russian officials and military bloggers have been blaming the leadership for not protecting military infrastructure from Ukrainian drone strikes throughout the full-scale war. After three years of war, Russia might finally be starting to build defenses at its airbases in response to Operation Spider Web, ISW analysts said.Operation Spider WebOn June 1, 2025, Ukraine’s Security Service launched a large-scale operation called Spider Web to destroy Russian bomber aircraft.Operation Spider's Web was one of the most secretive missions carried out by Ukraine's Security Service — with only a handful of people inside the agency aware of its details.Before the launch of Operation Spider’s Web, the Russian Air Force possessed approximately 130 strategic bombers.NATO sources have anonymously stated that the Ukrainian Security Service's Spider's Web operation was indeed large and that 40 Russian aircraft were damaged.