Uncle Sam standing on US ships in the Black Sea, looks through a spyglass on USSR with a sign “Provocation” on it.  Uncle Sam was widely used to represent USA.

This is one of many images portraying the USA as war mongers eager to use nuclear weapons at a solution to any and all international disputes. This caption above the flag with a bomb silhouette is "Zero Solution."

“Victory of Vietnam is a Victory of Solidarity”

While the Soviets backed the Vietnamese, they did so on a reserved basis, fearing that it could become a world conflict as the US increased involvement.  The Soviets sent 3,000 troops, a marginal number when compared to the United States.