Sentence:  His proposal is opposed to that of Richard Nixon , Governor Rockefeller , past chairmen Strauss and McCone of the Atomic Energy Commission , Dr. Edward Teller and those others now enjoying their hour of triumph in the <WSD>exacerbation</WSD> of the cold war . 
Meaning of the word marked with <WSD> tags:  action that makes a problem or a disease (or its symptoms) worse