Suppose Russia is deciding to Invade or Not Invade its neighbor Ukraine. The U.S. has to decide to be Tough or Make Concessions. They will make their decisions simultaneously. Their payoffs are as follows:

a. What is U.S.€™s best response when Russia chooses Not Invade?
b. What is U.S.€™s best response when Russia chooses Invade?
c. What is Russia€™s best response when U.S. chooses Tough?
d. What is Russia€™s best response when U.S. chooses Make Concessions?
e. What is the Nash equilibrium of this game?

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U.S. /Russia Not Invade U.S. gets 5 Russia gets 4 U.S. gets 3 Russia gets 5 Invade U.S. gets7 Russia gets 3 Tough U.S. gets 1 Russia gets 9 Make Concessions