Communications equipment has little to do with strategic partnership
India mostly buys Russian military equipment, French to a lesser extent, and lately some US and Israeli (and from few other countries, but is not that relevant) . There are various consideration with each purchase: quality/cost, political relations (especially considering Pakistan) , transfer of technology, strings attached (US often requires inspection of equipment they sold) etc ...
US and India could agree to share some data over compatible equipment, such transmissions are usually encrypted. It does not mean much for Russia, because they too certainly could communicate with Russian made equipment in Indian possession.
Real threat for Russia is the fact that they now have another competitor in Indian arms market, but this is hardly surprise. Russia was always aware that India could buy weapons from practically anyone (except China) , and they never deluded themselves that they have exclusive rights to that market. They just have to work harder and offer qualitative edge over their competitors. This is actually happening right now, as it look like India will buy S-400 SAM system from Russia.