Sentence:  If we look at the situation this way , we can get an idea of Khrushchev 's nightmarish worries - or , <WSD>at</WSD> least , of the worries he might have if his enemies were disposed to exploit their advantage . 
Meaning of the word marked with <WSD> tags:  if nothing else (`leastwise' is informal and `leastways' is colloquial)