Evo Morales' plane wasn't grounded by anybody; they chose to land, with a suspiciously convenient reason. Given Evo Morales whole anti-imperialist persona, and how he hyped his support for Snowden (appearing to consider offering Snowden asylum on a public TV interview just a day before, to hammer it home), and the fact that it's not even really clear which countries actually denied access to their airspace (the Bolivian account is disputed), and that nobody forced the plane to land or even requested it to, you kind of have to conclude that this was a political stunt by Evo Morales.
To put it this was: the US and it's allies were played for fools, highlighting their unreasonableness. But in no way shape or form is this similar to the current situations in anything but the most superficial sense.
That however, is not true; the air traffic control in Belarus directed them to land in Belarus; and scrambled fighter jets to intimidate them into compliance.
A kidnapping is not the same thing as denying entry; nor are the victims equally reasonable even if the crime were - a civilian plane vs. that of a diplomat that wanted to pick exactly this fight.
To put it this was: the US and it's allies were played for fools, highlighting their unreasonableness. But in no way shape or form is this similar to the current situations in anything but the most superficial sense.