Many large enterprises are cancelling all or close to all travel through the end of 2020. That may well cause the cancellation and consolidation of many flights that might have operated. In addition, it is impossible to determine what government entry restrictions may exist. Even those with citizenship or residence and who may enter, may find themselves quarantined.
Baseline rule is that if the flight goes, you are entitled to whatever the fare rules -- including any special Covid-19 waiver -- permit. That is generally a credit. If the flight is cancelled or refunded, you will be due a refund for all flights on EU and US carriers as well as all flights from the EU and to or from the US, regardless of carrier nationality.
This suggests doing nothing now. Even if you decide to cancel, wait for the carrier to do so (or significantly change the schedule). If that happens, request a refund. If it does not, you can always cancel for a Covid-19 credit on most carriers, up tot he day of travel.