French finance minister Bruno Le Maire warned that the bloc could succumb to nationalism if they failed in their attempts at reform.
Germany doubts any of the presidential candidates will tackle the political and economic problems faced by their French neighbours.
Far right said independent presidential candidate's decision to speak in English in Berlin showed he had 'no respect' for the French language.
Tunisian national Anis Amri, 24, who was shot dead by Italian police in Milan on December 23rd, was caught on CCTV footage at a central rail station in the French city of Lyon after escaping from Germany where he was wanted on suspicion of killing 12 people in an attack on a Christmas market in Berlin.
Fugitive Anis Amri, the Tunisian wanted as the main suspect in the Berlin Christmas market attack on Monday which left 12 people dead, was shot and killed by police in Milan early on Friday after entering Italy via the French town of Chambéry, in the south-east Savoie region, according to Italian officials.
French Prime Minister Manuel Valls, attending an aceonomic forum in Berlin on Thursday, said a far-right victory was possible in France's presidential elections next year and that 'Europe is in danger of falling apart', and called for strong leadership from France and Germany.
French president François Hollande and German chancellor Angela Merkel seek to restor calm over Brexit ahead of meeting in Berlin.
French president said current wave of migration from conflict areas in Middle East required coordinated response by 28-member bloc.
Manuel Valls took sons on official Falcon to watch Champions League final in Berlin, claiming his own presence was for official business with Fifa.
Manuel Valls took sons to Berlin on a government Falcon to watch Barcelona-Juventus match, but earlier claimed it was to meet with Uefa chief.
Shared sorrow over Germanwings plane crash has brought two countries closer together, as shown at inter-government meeting in Berlin.
President Hollande agreed that Europe needed to spur more growth – but said that Greece also had to abide by EU rules and obligations.
Michel Sapin says countries need to respect each others’ history and national identity - otherwise extreme parties will gain more support.