Germany on Monday extended border controls to all of its frontiers in an effort to limit illegal migration, in a move critics argue threatens Schengen area rules on freedom of movement. German police were to launch checks on crossings with Luxembourg, Belgium, the Netherlands and Denmark, expanding previous controls on crossings to Poland, the Czech Republic, Austria, Switzerland and France. Interior Minister Nancy Faeser, who ordered the checks, has promised that cross-border commuters should not expect major disruption to traffic. Faeser formally registered the new controls with the European…