Soviets viewed it as creating a defense for themselves, U.S. saw it as an act of increasing influence and challenge their hegemony.
Explanation:
Soviets were afraid of future attacks by west on their territory by expanding itself in Europe it was creating a buffer, which will avoid any future skirmish on Soviet.
U.S. had enough with the policy of appeasement and isolationism further they experienced that a expanding country will go on a war with them as Germany did.
The best option from the list would be the "Declaration of Independence," although it should be noted that Jefferson, when writing this, took inspiration from a variety of sources.
