I very much doubt these places will allow virtual visitors if they forbid real ones. That is, I doubt Google will be allowed to drive through North Korea with their cars. :)
I would guess that it will still work but at a (noticeably?) lower quality
The area around the White House is intentionally pixelated. Israel does not allow detailed maps in certain places - GPS navigation devices don't work there.
> The area around the White House is intentionally pixelated.
Not for the Russian "Google Earth" counterpart, it ain't. ;)