 The CBOE Volatility Index and VIX-related exchange traded funds climbed on Thursday as traders dumped risk assets in response to growing concerns over a potentially imminent Russian invasion into Ukraine. Among the best-performing non-leveraged ETFs of Thursday, the iPath Series B SP 500 VIX Short Term Futures ETN NYSEArca: VXX increased 8.9, and the ProShares VIX . 