Soviet Guerrillas Nabbed at Mexican Border - Does US launch First Strike?

Im imaging a mini-Red Dawn type scenario except it's completely bungled - leading to a small Corp of Soviets invading from Mexico being captured at the border.

If this happened, is it fathomale that the US would retaliate with a Nuclear Strike?
 
Im imaging a mini-Red Dawn type scenario except it's completely bungled - leading to a small Corp of Soviets invading on the group from Mexico being captured at the border.

If this happened, is it fathomale that the US would retaliate with a Nuclear Strike?
What makes the Soviets so suicidal?

Why did the US just sit there as Soviet forces entered Mexico?

What is the Mexican government doing in all this?
 
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