SpitfireIX
Philosopher
https://en.wikipedia.org/wiki/List_of_equipment_of_the_Indian_Army
I'm seeing a LOT of Soviet and Russian flags in the equipment origin column. Especially tanks.
Their Air Force operates Soviet/Russia, French, and home built planes. But they operate more Soviet/Russian than anything else.
It's true I didn't consider armored vehicles, which are mostly Soviet models. However, if you look at tube artillery, which is what the Russians need most, it's mainly 155s and 105s. India's only current Soviet-caliber guns are 130s, which are obsolete. In fact, they've converted almost half of their 130s to 155s.
As for infantry weapons, the Indian Army mainly uses 5.56 at the moment, though they have recently begun reequipping with new 7.62 Soviet assault rifles.
In any case, even apart from the issue of secondary sanctions, I doubt that either China or India are going to be eager to trade away significant amounts of artillery or ammunition, considering the rates of shell consumption we've seen in Ukraine.