An anti-riot vehicle stands in front of the Elysee Palace, as light coming from the window of the French president and his closest counsellors is seen, on December 7, 2018 in Paris, one day before the 4th nationwide mobilisation by the Yellow vests (gilets jaunes). - France is on red alert and Paris began to barricade on the eve of a new Saturday demonstrations of "yellow vests", a social and political crisis that tears the country and amazes the world. (Photo by ludovic MARIN / AFP)

An anti-riot vehicle stands in front of the Elysee Palace, as light coming from the window of the French president and his closest counsellors is seen, on December 7, 2018 in Paris, one day before the 4th nationwide mobilisation by the Yellow vests (gilets jaunes). - France is on red alert and Paris began to barricade on the eve of a new Saturday demonstrations of "yellow vests", a social and political crisis that tears the country and amazes the world. (Photo by ludovic MARIN / AFP)

Lights come from the windows of the French president and his closest counsellors of the Elysee Palace, on December 7, 2018 in Paris, one day before the 4th nationwide mobilisation by the Yellow vests (gilets jaunes). - France is on red alert and Paris began to barricade on the eve of a new Saturday demonstrations of "yellow vests", a social and political crisis that tears the country and amazes the world. (Photo by ludovic MARIN / AFP)

Lights come from the windows of the French president and his closest counsellors of the Elysee Palace, on December 7, 2018 in Paris, one day before the 4th nationwide mobilisation by the Yellow vests (gilets jaunes). - France is on red alert and Paris began to barricade on the eve of a new Saturday demonstrations of "yellow vests", a social and political crisis that tears the country and amazes the world. (Photo by ludovic MARIN / AFP)

Lights come from the windows of the French president and his closest counsellors of the Elysee Palace, on December 7, 2018 in Paris, one day before the 4th nationwide mobilisation by the Yellow vests (gilets jaunes). - France is on red alert and Paris began to barricade on the eve of a new Saturday demonstrations of "yellow vests", a social and political crisis that tears the country and amazes the world. (Photo by ludovic MARIN / AFP)