I wish there was a clear definition for the term "saboteur".
The action performed is pretty well settled, but who are saboteurs?
Are they Russian soldiers behind enemy lines?
Are they pro-Russia Ukrainians/partisans?
Are they foreign nationals working on behalf of either the Russians or pro-Russia Ukrainians?
Because, though the action itself remains the same, the implication is pretty different.
Russian soldiers behind enemy lines would be just like any other unit of any other army; working behind the enemy to disrupt supplies, communications, etc... it pretty common and routine.
The other two though... I don't know... maybe something akin to domestic terrorism?