NonCredibleDefense

Aside from Lend-Lease materiel in Russia, which would have been provided in a more-friendly environment, the US was part of the Allied intervention in Russia during World War I. This was after the Russian government collapsed mid-war, and materiel that had been sent to the Russian government was at risk of being seized by the Bolsheviks. The aim was to secure that and to help evacuate the Czechoslovak Legion.

There were two small US military forces that entered Russia, one in the west and one in the east.

https://en.wikipedia.org/wiki/American_Expeditionary_Force,_North_Russia

The American Expeditionary Force, North Russia (AEF in North Russia) (also known as the Polar Bear Expedition) was a contingent of about 5,000 United States Army troops[1] that landed in Arkhangelsk, Russia as part of the Allied intervention in the Russian Civil War. It fought the Red Army in the surrounding region during the period of September 1918 through to July 1919.

U.S. President Woodrow Wilson sent the Polar Bear Expedition to Russia in response to requests from the governments of Great Britain and France to join the Allied Intervention in North Russia (also known as the North Russia Campaign). The British and French had two objectives for this intervention:[2]

• Preventing Allied war material stockpiles in Arkhangelsk (originally intended for the recently collapsed Eastern Front) from falling into German or Bolshevik hands

• Mounting an offensive to rescue the Czechoslovak Legion, which was stranded along the Trans-Siberian Railroad

https://en.wikipedia.org/wiki/American_Expeditionary_Force,_Siberia

The American Expeditionary Force, Siberia (AEF in Siberia) was a formation of the United States Army involved in the Russian Civil War in Vladivostok, Russia, after the October Revolution, from 1918 to 1920. The force was part of the larger Allied North Russia intervention. As a result of this expedition, early relations between the United States and the Soviet Union were poor.

It's also possible that some kind of military hardware might have been sold to Russia prior to World War I, though I'm not familiar with any particular item, and I'm not sure at what point American industry would have become competitive enough with Russian industry to make it worth it for Russia to obtain military hardware from the US; the early US would definitely have been behind Russia in military industry. Prior to the World War era, relations with Russia were generally warmer.

John Paul Jones wound up working for Russia, and I suppose perhaps some of his contemporaries might have as well, but I don't know if there was any kind of materiel moving.