Well, technically a rocket that just goes into orbit to ram a satellite (or even blow it up with a conventional warhead) does not violate any treaties. So Russia is as free to develop that technology as we are.
That ship has sailed. To and from both continents. For over 35 years.
does not violate any treaties.
Well... the treaty was made AFTER THE FACT that both the US and USSR developed and launched and tested their anti-satellite weapons. Neither Russia nor the US wanted any 'competition' so they came up with the treaty to ensure no one else could put one of these in orbit. And they weren't the 'ramming' type.
I watched the DEMO of the Russian anti-sat. It was done over the US specifically so we could watch. The guy who developed the weapon that was on board the satellite defected to the US and helped us create one , in the hopes that with both sides having it, neither would use it. It has worked so far.