The US State Department immediately declared that they are not involved in any plot to make an attempt on [Lukashenka's life]. That is, they are not denying the conspiracy itself but only declared that they are not involved. However, who is going to believe the Americans now? In an absolutely similar manner, they were denying their involvement in the coup attempts in Venezuela and in the attempt on Maduro's life.
The US pretends that nothing has happened and the case of the detained US citizen is planned to be dealt with as normal. However, judging by the events that immediately took place in Czechia, the United States admitted its failure. The thing is that Czechia, all of a sudden, announced that military warehouses on its territory were blown up by Russians back in 2014. This whole story is meant to serve as a cover-up for the failed coup d'etat in Belarus.