Yes, I meant what I said. They were unimposing and looked more like high school students than soldiers. I believe you may be thinking of the Soviet Army of the cold war era rather than the current Russian Army. The Russian Army of today has about 350,000 active duty personnel of whom about 70 percent are conscripts. It currently has about 2,500 main battle tanks; 3,200 Infantry Fighting Vehicles; 2,800 Armored Personnel Carriers; and 4,300 towed and self-propelled artillery pieces. Not the tens of thousand you refer to.
The Russian economy is very small compared to the United States; its' Gross Domestic Product is 1.28 trillion USD which is just seven percent the size of the U.S. GDP of 18.6 trillion USD. The states of California and Texas each have state economies that are twice the size of Russia's. This all means that Russia doesn't have the economic depth to compete with the U.S. In addition, the Russian economy is highly reliant on the export of commodities like petroleum which can fluctuate greatly whereas the U.S. economy is more diversified and resilient. This puts them at a great disadvantage vis-a-vis the United States.
Earlier this summer, in Syria near the Iraqi border, a large formation of Russian "mercenaries" attacked a small U.S. Army Special Forces unit and Kurdish militia. They were equipped with modern tanks, AFV, artillery, etc., and yet we kicked their *****, killing about 300 of them using artillery, drones, and air power while suffering zero casualties. I would not underestimate the fighting ability of the professional U.S. Armed Forces versus the Russians or anyone else for that matter.