If it’s not just about the type of vaccine, then it’s possible for this to happen again anywhere in the world.
Most likely that's the cause:
Top Chinese official admits vaccines have low effectiveness
They've rushed that vaccine as a form of propaganda to smaller and poorer countries and this is going to backfire.
Chile was sending
alarm calls for a while, in extreme cases with that efficiency you could basically halve the numbers of vaccinated people, Seychelles might have 60% but if the vaccine worked for only half of them it means they are just like the average EU country at this point, but with a dangerous variant, an influx of tourist and no restrictions that all combined have fueled the spread.
And there is also one more aspect I couldn't find simple google searches, who percentage of the new cases are locals and how many of those infected are tourists?
I wonder how effective Sputnik is, Hungary is the global leader percentage of deaths to population, doing two times worse than neighboring Romania who uses Pfizer.
Anyhow, probably we'll find out sooner than expected, the new Indian variant is already in the Uk from the start of the month, let's see how this will turn out.
Oh, and one more thing, probably the number of infections will not be that important as the number of deaths from it.