Yes, Russia, like any other state, could intercept airplanes too. But so far, they have not. International air travel means, that you have to fly across many countries, if you want to fly in a somewhat straight line. There are a few exceptions, where flights are not permitted to cross a countries airspace, but intercepting approved flights is pretty much unheard of. That is why the actions from Lukashenko created so much outrage. It is one of the fundamental agreements of international flights that got violated. If Russia would start intercepting airplanes, they would be internationally isolated quite quickly.

Another problem is the kidnapping of a passenger who then got promptly very sick and damaged in the friendly heavy hands of the KGB and police. You know, the usual thing the totalitarians do.