Which countries require travellers to undergo quarantine upon arrival?

After a year of relative calm and relaxing Covid-19 guidelines, following an uptick in new Covid-19 cases being reported globally, a few countries have renewed their entry restrictions, re-introducing quarantine on arrival to permit travellers into the country.That being said, here is the complete list of countries currently mandating quarantine requirements for international passengers entering the country. Quarantine-free travelWhile some...