He explains that he had considered that his detention in Belarus for 80 days constituted a short period, and he was in custody (in an investigation detention centre), but not in prison.
他解释说，他以为在白俄罗斯80天只是短期拘留；并且以为他是在一个调查拘留中心受到拘押，而不是在监狱中服刑。