Each country has its own set of rules for entry and transit for different nationalities, which are changing often due to the pandemic. Some of the countries may require a transit visa, even if you have a shortstop or change terminals. Passengers who have a transit in the airports within the European Union – Schengen Zone, may need a Schengen Entry visa.
In order to check the visa requirements, please contact the embassy of the country you are traveling to and the countries you will be visiting on the way, even for transit. You will need to specify the reason and period of time you will spend in the country, in order to receive the appropriate information on visa requirements.