We had the same problem, but with Russia. Ours being a paid app and our reviews being in the low 1000s, every 1-star rating was hurting us badly, so we removed

We had the same problem, but with Russia. Ours being a paid app and our reviews being in the low 1000s, every 1-star rating was hurting us badly, so we removed Russia completely from our distribution. We added it back a month later and things went back to normal, but that's definitely something that we shouldn't need to have done.