Discount on Western Canada Select Heavy Crude Narrows

* WCS for April delivery in Hardisty, Alberta, settled at $12.15 a barrel under WTI, according to brokerage CalRock, after having settled at $12.70 under the U.S. benchmark on Thursday.

* The tumultuous week saw U.S. President Donald Trump on Tuesday apply 25% tariffs to most Canadian goods and 10% to Canadian energy products.29dk2902l

* Canada exports approximately 4 million barrels of oil per day, about 90% of its total crude exports, to the United States.

* But on Thursday, Trump suspended the tariffs for an additional month, though a White House official said not all energy products would be covered by the exemption.

* Globally, oil prices gained on Friday but retreated from session highs after Trump threatened sanctions on Russia if it fails to reach a cease-fire with Ukraine.