The European Union is expected to have the upper hand when it formally begins Brexit negotiations with British Prime Minister Theresa May as it look to send a message to euroskeptic members of the regional bloc.

Nine months after the historic Brexit referendum, May will notify the European Council on Wednesday that the U.K. will officially terminate its 44-year old membership with the E.U. The move paves the way for talks on two key sectors: terms of the divorce, which includes residential rights of both citizens and the U.K.'s financial obligations, as well as future economic relations.