The first and only time Latvia has hosted the World Ice-Hockey Championship was 2006 when games were held at the newly-built Arena Riga and the Skonto hall. Latvia finished tenth.
The Latvian Ice-Hockey Federation (LHF) has campaigned repeatedly for the right to host the championships since. Former Prime Minister and current head of the LHF Aigars Kalvītis will be attending the presentation of the joint bid at Minsk, together with the organization's secretary general Viesturs Koziols.
Minsk has hosted the championship once, in 2014, with Latvian hockey fans saying it had been held very well.
This year Germany's Cologne and France's Paris will host the championship jointly.
The International Ice Hockey Federation could decide over the location of the 2021 championship in its annual congress in May.
The joint application to host the championships was signed on Thursday in Minsk, said Ušakovs on Twitter.
"In 2021 Minsk and Riga want to jointly organize the World Championship in hockey. The application was just signed. Fingers crossed!"