sentences:  In September 2014, "Politico" formed a joint venture with German publisher Axel Springer SE to launch its European edition.In December 2014, the joint venture announced its acquisition of "Development Institute International", a leading French conference business, and "European Voice", a European political newspaper previously part of the Economist Group, to be relaunched under the "Politico" brand.Among the participants of the launch event on April 21, 2015, was President of the European Council Donald Tusk and then President of the European Parliament Martin Schulz.