Don't think anyone will do the Sensex or Russia.
IG's India 50 is based on the Nifty contract, which is the NSE index. Sensex is based on the Bombay Stock Exchange Index. The futures 'trade' on the USFE, but the volume is absolutely appalling (roughly 0). If no SB can hedge it they won't quote. Russia is similar; although not as bad - the futures are not easy to trade, so I doubt anyone will touch it. There used to be the RTX index in Austria, based on Russian stocks, which IG quoted, but not sure whether they still do.