At 11.45 am on Thursday, the core equity indices i.e., Sensex and Nifty 50 were trading higher amidst the increasing tension between Russia and Ukraine. The Sensex was at 55,623.60, up by 154.70 points or 0.28 per cent, while Nifty was at 16,644.60, up by 38.65 points or 0.23 per cent from the last trading session.