How is it that Mongolia and Russia have nominal cases of Covid-19

They are likeliest to be the countries where the disease would spread quickly and viciously, still have very few confirmed cases of COVID-19 [1]

[1] https://www.forbes.com/sites/breannawilson/2020/03/16/mongolia-announces-3-new-covid-19-cases-totaling-4-how-they-got-coronavirus-precautions-right/#f3f4f434fc9e