Nonviolent action involves ...

Nonviolent action involves opposing the opponent's power, including his police and military capacity, not with the weapons chosen by him but by quite different means. Repression by the opponent is used against his own power position in a kind of political "ju-jitsu" and the very sources of his power thus reduced or removed, with the result that his political and military position is seriously weakened or destroyed.
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 Gene Sharp

Quotes from the same author

The degree of liberty or tyranny in any government is, it follows, in large degree a reflection of the relative determination of the subjects to be free and their willingness and ability to resist efforts to enslave them.
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 Gene Sharp
Further, democratic negotiators, or foreign negotiation specialists accepted to assist in the negotiations, may in a single stroke provide the dictators with the domestic and international legitimacy that they had been previously denied because of their seizure of the state, human rights violations, and brutalities. Without that desperately needed legitimacy, the dictators cannot continue to rule indefinitely.
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 Gene Sharp
Violence by the defenders will be used by the putschists to justify overwhelming repression which they want to use anyhow. It will be used to CLAIM that the putschists are saving the country from ‪‎terrorism or ‪#civil war‬, and are preserving "‪law‬ and ‪‎order‬
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 Gene Sharp
Dictatorships usually exist primarily because of the internal power distribution in the home country. The population and society are too weak to cause the dictatorship serious problems, wealth and power are concentrated in too few hands. Although dictatorships may benefit from or be somewhat weakened by international actions, their continuation is dependent primarily on internal factors.
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 Gene Sharp