Canada’s Inter Pipeline Ltd. told shareholders to accept a $8.6 billion (US$6.8 billion) hostile takeover offer from Brookfield Infrastructure Partners LP, days after walking away from a friendly deal with Pembina Pipeline Corp.

The move pushes the months-long battle for Canada’s fourth-largest midstream company closer to a resolution. Brookfield sweetened its bid on July 15 to win over Inter Pipeline shareholders, while prominent advisory firms Institutional Shareholder Services Inc. and Glass Lewis & Co. recommended that investors vote against Pembina’s all-share offer.

Pembina and Inter Pipeline terminated their agreement on Monday, leaving Brookfield as the only remaining bidder.

“To maximize shareholder value we ran a fair and comprehensive strategic review and as a result Brookfield increased its offer by approximately 21 per cent,” Inter Pipeline Chair Margaret McKenzie said in a statement Tuesday night. The improved terms make it “appropriate to recommend acceptance of the revised Brookfield offer to our shareholders.”

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The pursuit of Calgary-based Inter Pipeline follows years of failed attempts to build major energy infrastructure projects including TC Energy Corp.’s Keystone XL and Energy East, which has made existing lines potentially more valuable. Inter Pipeline owns pipeline infrastructure across Western Canada, connecting oil and natural gas producers with domestic and foreign customers.

The drama began in February with an unsolicited $7.1 billion offer from Brookfield that was rejected by the company’s board, which later endorsed a June 1 takeover offer by Pembina. Brookfield countered by boosting its offer multiple times.

Brookfield’s latest offer comprises $20 per Inter Pipeline share in cash or 0.25 of a Brookfield Infrastructure Corp. share, subject to proration. A representative for Brookfield declined to comment following Inter Pipeline’s recommendation to investors.

Inter Pipeline’s shares were little changed at $19.99 at 9:42 a.m. in Toronto. Brookfield Infrastructure Partners was 0.3 per cent higher at US$54.37 in New York.

Inter Pipeline said it’s paying a $350 million termination fee to Pembina as part of their agreement.