Occidental Petroleum OXY.N slipped 2.6%, leading energy shares lower as oil prices dropped from a seven-year high. By Devik Jain and Susan Mathew Feb 15 (Reuters) - Wall Street futures surged on Tuesday on signs of a de-escalation in tensions between the Russia and Ukraine, with investors also awaiting key inflation data for clues on the path of interest rate hikes by the Federal Reserve. O/R The CBOE Market Volatility index .VIX, a gauge for investor anxiety, fell back after shooting up to its highest level in nearly three weeks in the previous session.