BRUSSELS (AP) — The European Union's incoming economy chief, Pierre Moscovici, vowed Thursday to be an impartial and tough enforcer of the bloc's deficit rules even though he failed to implement them as French finance minister. France has missed several deadlines to bring its budget deficit under the EU limit of 3 percent of gross domestic product and to trim its debt burden. Moscovici's nomination to the 28-nation bloc's executive Commission attracted sharp criticism from conservatives and deficit hawks, who said he cannot be trusted with enforcing rules he helped flout just months ago.