You will be given a context and a verb separated with a newline character, and you have to answer if the given verb is a negation or not. A verb is a negation if it is not going to exist, not happen, or has no effect. The output should be "Yes" if the verb is a negation and "No" otherwise.

Let me give you an example: Only the government of the United States can decide if it prefers this variant, continued the letter, which Castro read on a state television station broadcast. Gonzalez for months refused requests by Elian's Miami relatives to go to the United States to (claim) the boy.  
 Verb: claim
The answer to this example can be: Yes
Here is why: This is a good example. Gonzalez refused to "claim" the boy. So, the claim didn't happen and it's a negation.

OK. solve this:
And when he and President Gorbachev spoke about the decision in a talk lasting nearly an hour, the President took pains to listen to what his counterpart had to say, although he already had decided that the Soviet alternative to the allied deadline was unacceptable. Finally, when Iraq failed to (respond) to the U.S. ultimatum, Mr. Bush let the ground offensive begin as previously planned Saturday night.  
 Verb: respond
Answer:
Yes