French Prime Minister Manuel Valls has said he fears Europe is at risk of breaking apart, reports Sky News.
Mr Valls was speaking at an economic forum in Berlin, where he told his audience that France and Germany "must be strong" and give European projects a new foundation.
His speech comes as the European Union looks towards a bloc without Britain, which in June voted to leave and is expected to formally begin the process next year.
Europeans are also watching and waiting to see how their situation might change once Donald Trump takes office as US President in January, following a campaign in which he said European countries should take more responsibility for their own defence and that he would quit some free trade agreements.
Meanwhile, political parties such as Marine Le Pen's far-right Front National in France are gaining ground and could change the face of politics in their country - and the continent.
Mr Valls, prime minister since March, 2014, said Ms Le Pen stands a chance of winning next year's presidential election in France, boosted in part by Mr Trump's shock win in the US.
In response to a question from his audience asking whether the popular candidate of the anti-immigration party could win, Mr Valls replied: "It's possible".
"This means that the balance of politics would change completely," he said, adding a warning of the "danger presented by the extreme right".
His words come as leaders from the US, UK, Germany, Italy, Spain and France prepare to meet in the German capital later this week.
Barack Obama arrived on Wednesday night for what will be the last leg of his final European tour as US President, hoping to ease fears about the future of the trans-Atlantic partnership under Mr Trump.