Here's what rhymes with unilaterally.

Consider these alternatives

unilateral / natural declare / their withdraw / law declared / help disengage / stage abrogate / great cease / peace formally / normally unless / less effectively / respectively declares / self imposed / most impose / those abrogated / dated borders / orders retaliate / late ceasefire / fire seceded / preceded quo / no redraw / law dismantle / sample agreeing / being renounce / towns invade / made secede / need negotiate / state declaration / operation amend / went moratorium / auditorium hostilities / abilities abide / side proclaim / same insisting / existing accords / towards militarily / necessarily