Not necessarily. Major/super powers have had aircraft shot down in the airspace of other countries and they couldn’t do a thing. The Pakistanis downed several Soviet aircraft during the Soviet invasion of Afghanistan. More than one USAF spy plane was shot down by the Soviets and pretty much nothing happened.
Very true. Russia’s response may range from silence to full and total payback. History unfolding is a sight to see.
Russia shot down Korean flight 007 in 1983, and they armed the Russians in Ukraine who shot down Malaysian Flight 17 without any serious fall out. Putin even denied the obvious facts.