3. What is Castro asking Khrushchev to do when he writes “... if they manage to carry out an invasion of Cuba-a brutal act in violation of universal and moral law–then that would be the momnt to eliminate this danger forever, in an act of the most legitimate self-defense. However harsh and ter- rible the solution, there would be no other."?

Anwer: not to mannage carry out an invitation

Explanation:

Else there will danger

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

answer; taking up arms to defend the nation;