Azerbaijan has bought oil and natural gas from Russia to meet internal demand while exporting its own energy riches to the West. Russia also has been the main market for Azerbaijan’s fruit and vegetable exports. It also is a key transport corridor for Russia’s trade with Iran and other partners in the Middle East.

The rift, provoked by the deaths of two ethnic Azerbaijanis in Russian custody, was the latest in a series of spats that revealed a deeper diplomatic rift between the former allies.

The Russian Foreign Ministry on Wednesday urged Azerbaijan to restore its ties with Moscow to a level befitting "strategic cooperation" after saying that certain forces were trying to wreck the two countries' relationship.