CANADA STOCKS-TSX weighed by Ukraine tensions, bank shares

* TSX down 20.54 points, or 0.13 percent, at 15,535.55 * Three of 10 main index sectors decline * Energy shares slip with oil price (Adds details, quotes, updates prices) By John Tilak and Leah Schnurr TORONTO, Aug 22 (Reuters) - Canada's main stock index slipped on Friday, pulling back from another record high hit earlier in the day on concerns of a further escalation of tensions in Ukraine and as shares of financial and energy companies fell. The market saw muted reactio