Johannes Volkmann

The provided articles do not contain any information about Johannes Volkmann. Therefore, it is impossible to provide a summary about him based on the given text. The first article discusses Juso-Chef Philipp Türmer's appearance on the Markus Lanz show, where he presented his "justice program" and debated tax issues. The second article focuses on criticism of Wolfram Weimer, the Staatsminister für Kultur, and the erosion of support for him within the Unionsfraktion. The articles highlight political debates and internal conflicts within German political circles, but neither mentions Johannes Volkmann.