The U.S. has already committed acts of war against Russia. From Philip Giraldi at unz.com:
The White House keeps insisting that it will not directly involve American soldiers in the war in Ukraine, but it keeps taking steps that will inevitably lead to a large-scale open combat role for the US against Russia. Among the most recent moves to increase the pressure on the Kremlin, Biden revealed at a NATO summit meeting in Madrid on June 29th that the US will establish a permanent headquarters in Poland for the Fifth Army Corps, maintain an additional rotational brigade of thousands of troops in Romania and bolster other deployments in the Baltic states. Also, the number of US troops in Europe, currently approaching 100,000, will be increased. Biden also was pleased to learn that Turkey had been enticed to drop its objection to Finland and Sweden joining NATO.
On the way to the NATO summit aboard Air Force One, Biden’s National Security Adviser Jake Sullivan advised that “By the end of the summit what you will see is a more robust, more effective, more combat credible, more capable and more determined force posture to take account of a more acute and aggravated Russian threat.” Presumably Sullivan was reading from a prepared script, but the objective surely seemed to be to heighten tension with Moscow rather than attempt to reduce it and come to some kind of diplomatic settlement.