"The meeting in the Belarusian Foreign Ministry has been coordinated for the first half of the day," Mezentsev said, refusing to provide any other comment prior to the talks.
Belarusian Security Council State Secretary Andrei Ravkov said on Wednesday that the Foreign Ministry would invite Russian and Ukrainian ambassadors to discuss the situation, since at least 14 of the detained Russians were "spotted" in Donbass.
Russian citizens that were detained in Belarus on the night into Wednesday on suspicion of planning to destabilize the situation ahead of the 9 August presidential election started testifying, Belarusian Security Council State Secretary Andrei Ravkov told reporters on Thursday.
Ravkov later said that Belarus has opened a criminal investigation into the preparation of terrorist attacks in connection with recent detentions. The official also expressed the belief that up to 200 "militants" could be staying in Belarus, adding that searches were underway.
The detention took place on the night into Wednesday.
On Wednesday evening, Belarusian President Alexander Lukashenko called an urgent meeting with members of the country's Security Council in connection with this detention.