About leaving France, there is no contradiction between the 1km rule and the possibility to leave the country:

• The 1km rule applies to "leisure activities", such as jogigng or walking the dog.
• Other things such as going to work or buying something in a shop that is open is allowed, without any limitation on distance.

So, if you travel abroad for business, just tick the box for "going to work". No rule in France says that work cannot be in New York, Milan, or Shanghai (whether they let you in is a different quesiton, but not of relevance for the French legislator). For instance, I plan to travel to Switzerland, and fill in an employer's form myself - I am a Managing Director of my company in Switzerland, so I can sign myself on behalf of the company (and I have foreign passport and foreign address in addition). Same thing, you can travel to see your kids or elderldy parents. If you want to travel just for leisure, well you aren't supposed to and the rules don't allow it.

What is confusing though: I have seen news reports that state that a negative PCR test is required to enter France, irrespective of whether you arrive from a EU/Schengen/UK country, or a country outside that area. Other sources say that negative PCR test are required only for passengers arriving from non-EU/Schengen/UK. Anyone knows more or can point to an unambiguous source?