In official FAQ there is rule about movement through activation token. As far as I remember in official instruction there is statement that there is no possible to leave field where activation token is. Can you clarify this fro me?

FAQ:

Q: Can units move through areas containing friendly activation tokens?
A: Yes.

Yes. If a unit is in an area with an Activation Token, then it cannot move. If a unit can move 2 (or more) spaces, it can move through an area with an Activation Token (into and out of with one action...)

The activation tokens were not meant to "block" future movement, only to prevent you from activating that area again during that year, and to prevent units that are in the area from moving out. As Titeman says, a token does not prevent a unit who is not in the activated area from moving two spaces THROUGH the area.

That was why the FAQ question was put there - to clarify the intent.