Base contact rule say's:Miniatures cannot move into base contact with miniatures from enemy units unless the unit leader has a melee weapon
Compulsory move rule say's:If it cannot do so, or if a full move would cause any part of the unit leader’s base to be outside the battlefield, it can perform a partial move instead, ending its movement as far along the movement template as possible.
I perform compulsory movement and bump into AT-ST because i cannot overlap bases. I stop into base contact with AT-ST or 0,1 mm before AT-ST?