On the other hand, in the same article the WHO also said that they expect things to continue to improve, or stabilise, despite the gradual move to open restrictions.
https://www.bbc.co.uk/news/world-europe-53175459
This is the WHO's data for Europe. Between the 11th June and 17th June there were 18,900 cases per day, between the 18th June and 25th June (today) there were 18,700 cases per day.
They didn't specify the 11 countries where
"accelerated transmission has led to very significant resurgence that if left unchecked", but using their data they seem mostly to relate to Eastern Europe. Armenia, Sweden, Moldova, North Macedonia, Azerbaijan, Israel, Kazakhstan, Kyrgyzstan, Albania, Bosnia and Herzegovina and Ukraine have seen an average of 25+ cases per 100k over the last 14 days (the UK are at 25 now), which represents a 20%+ increase on what happened 2 weeks ago.
The trend for essentially all of those countries is they didn't have a first wave.
When Western Europe was having its peak, they weren't. They didn't have the same level of community transmission but they did implement some lockdown measures, so they kept a lid on things in a way Western Europe were unable to do. Sweden have obviously been doing their own thing.
Cases for 11 Countries Combined
There's no increase in cases for the other 43 countries combined, just a general levelling off since around Mid-may.
Cases for Remaining 43 Countries Combined
It's mostly the same in the US. The places that are struggling now are primarily the ones who weren't hit so hard in the beginning. A delayed first wave rather than a second wave. California locked down hard and fast, and relaxed restrictions in a much more measured way than the majority of states, but they're struggling regardless. Those who did well in the beginning - whether it was through good fortune, like Texas or Armenia, or whether it was through concerted action, like California or Bulgaria - are essentially being punished for it now.