MANILA, Philippines — Stocks wiped out gains from the previous session, returning to negative territory yesterday, as investors continue to worry over the still unresolved conflict between Russia and Ukraine. The 30-company benchmark Philippine Stock Exchange index (PSEi) finished at 7,304.02, down 100.59 points or 1.36 percent. The broader All Shares index slipped to 3,880.74, down 40.31 points or 1.03 percent. The sectoral gauges ended in the red as well except for mining and oil, which stayed in positive territory as the lingering tensions continue to push oil and commodity prices upward. T…