Idk how well known this is but the US and Russia constantly send aircraft to the edge of each other's air defense bubbles. One side sends bombers, the other side scrambles interceptors, they do their little dance, then everyone goes home. I don't think it's daily but it's at least monthly, and it's been happening since the Cold War. China and the US do it all the time in the South China Sea, with aircraft patrols harassing each other or ships tailing each other. Even allied nations do it. Probing other nation's air defenses is a very normal part of day to day international military operations.

Also, as far as I know, there are always a bunch of gigantic weather balloons puttering around in the jet stream. Research balloons break from their moorings all the time and can travel enormous distances in prevailing winds. It's not unusual at all and it's only in the news this month because the media wants people focusing on China Bad instead of US police executing disabled people, the WWI chemical weapons train, the price of food, and a dozen other domestic crises.