The only solution for Europeans is to 'keep calm and stay united', defense specialist says

Speaking with FRANCE 24's Sharon Gaffney, Frédéric Mauro, Associate Researcher at IRIS in Brussels, says that European leaders must be much be more vocal in defending European territories, and that the only solution is to 'keep calm and stay united', adding that 'union is what will deter Donald Trump' against annexing Greenland.