Any direct transactions will trigger Western sanctions. This is being called a 'hack' so India's biggest cement maker can buy from Russia. 157k tonnes worth $25m (172m yuan). The sale was arranged from Dubai, reportedly. The mechanism isn't known.
Coal is the main fuel to manufacture cement.
13% of Russian reserves are already in yuan. Indian companies must be trading USD for yuan in a Chinese bank in China or HK. There are no sanctions if you don't use USD.
Yuan to Ruble trade has increased 1000% since the invasion of Ukraine.