"We at OPEC aim to optimise our relationship with Russia for the long term," Saudi Energy Minister Khalid al Falih told Reuters at the World Economic Forum in Davos.

"A quick fix is not a big objective. We want this to be a lasting partnership. We have to be flexible when we intervene. Our partnership will evolve over time."

(Reporting by Dmitry Zhdannikov; writing by Alex Lawler, editing by Susan Thomas)