With a NATO war and Ukraine's knack for shooting down planes in mind, Russia is holding back its airpower and most advanced jets

• Russia is holding much of its airpower and more advanced jets in reserve, experts say.
• One concern for the Russians is Ukraine's air defenses, which have shot down a number of Russian aircraft.
• Another consideration is that these assets could be needed in a larger potential war with NATO.

Russia has kept much of its airpower and some of its most advanced aircraft out of the war in Ukraine. Experts say doing so signals Russian worries about Ukraine's air defense game but also considerations beyond this fight to one with NATO.