US has provided 7000 Javelins to UA (https://www.csis.org/analysis/will-united-states-run-out-javelins-russia-runs-out-tanks)
Counting all countries, over 17000 ATGMs have gone to UA (https://taskandpurpose.com/analysis/ukraine-javelin-stinger-missiles-russia/). Maybe more by now.
UA has used ATGMs to attack many types of RU armor, not just tanks including Armored Fighting Vehicles, Infantry Fighting Vehicles, Armored Personnel Carriers. Counting all armored vehicles, over 2000 RU assets destroyed/captured. UA has probably even used ATGMs against RU trucks.
How many of the 17,000 have been used? We don’t know but I would guess they still have half of those unused and with their deployed forces.
To answer your question, can RU produce tanks faster than the US produces Javelins? No.
“The United States has been buying Javelins at the rate of about 1,000 a year. The maximum production rate is 6,480 a year, though it would likely take a year or more to reach that level.” (https://www.csis.org/analysis/will-united-states-run-out-javelins-russia-runs-out-tanks)
RU can produce approximately 200 tanks per year.
Yeah, this pretty much confirms that either they don’t work, or the Ukes absolutely are incompetent in how to use them. If 17,000 have been provided, and even half fired, that’s a pathetic kill ratio, even if you include all vehicles. But of course, most of those vehicles were not killed by Javelins but by other weapons, including mines, artillery, air, etc.
I think the manufacturer said they were bumping to 4,000 this year, which would still leave us in a huge hole.
But more concerning, if the Ukes used say half of these 8,000 and if only half the Russkie armor/vehicles were killed by these (i.e., 1,000) that means that the kill ratio is 8 Javs for one vehicle. Either these don’t work well, or the Ukes are incompetent.