To get the world back into production, each culture has to demonstrate a considerable level of safety on location, which is pinned first and foremost to the spread of infection.
It only takes one sick person to stop an entire production. Overseas partners will be even more sensitive because they generally earn more money, have combative agents, and have a specific contract period. This all adds up to antsy negotiations. So each culture is developing some kind of formal protocol which will articulate the lineaments of a COVID-19 production precisely.