Yes, you can temporarily accept orders and ship to a particular country or region.
Below is a simple step-by-step guide how to enable this for your online store (using Shopify as an example). Please note, during the time a country/region is turned on, anyone can order from that geo.
1. Go to the “Settings” section in your Shopify store, then click on “Shipping”.
2. In the “Shipping” section click on “Manage rates”
3. Click on "Create shipping zone" or "Edit Zone" to update the list of countries/regions you accept orders from.
4. Review the list update you made and save those changes
Please note, when you are ready to disable the country/region simply go to the appropriate zone, unselect the geo and save your changes