The executive power of Meghalaya shall be so exercised as not to impede or prejudice the exercise of the executive power of the Union or the Government of Assam, as the case may be, and the executive power of the Union and the State of Assam shall extend to the giving of such directions to Meghalaya as may appear to the Government of India or the Government of Assam, as the case may be, to be necessary for that purpose.