Each tier will involve increasingly stricter restrictions with the system designed to tackle the virus on a regional level.
Earlier this year, China screened the whole city of Wuhan, home to around 11 million people, for the virus.
From Saturday, the cities of Lille, Lyon, Grenoble and Saint-Etienne will be designated maximum alert zones.
"I’m feeling good. Really good. I think perfect," Trump said of his condition. It is not known whether the president is still contagious.
"As Saudi Arabia is to oil, the UK is to wind – a place of almost limitless resource," said UK PM Boris Johnson, outlining plans for a post-COVID green recovery.
Measures that are rightly being put in place by governments to restrict the spread of COVID-19 are now being used as a means to put an end to our right to protest when they make poor decisions.
In this edition we look at how relations between Brussels and Budapest soured over democratic values, and also at how the cultural sector can be revived post-pandemic.
While Europe's unemployment rate is still modest compared with the spike seen in many other countries, economists predict it could hit double digits in coming months as wage support programs expire.
Belgium's death toll from the virus passed 10,000 on Wednesday as cases soared in the UK, breaking its daily new cases record.
Passengers and crew on board the vessel are now confined to the ship while Greek health authorities carry out further tests.
The US has recorded the highest number of coronavirus deaths and infections in the world, followed by Brazil and India.
The total number of deaths also rose by 26 in the same 24-hour period, bringing France's death toll from coronavirus to 31,274 since March.
Thousands protested job cuts and wages as COVID-19 cases rise in France.
The stricter measures announced in Bordeaux and Marseille follow a surge in new cases. The French government wants to avoid a new nationwide lockdown.