Turkish President Recep Tayyip Erdogan is considering major acquisitions of defense and nuclear technology from Russia, raising the specter of an unprecedented divorce within the NATO alliance.

“The extent of the bilateral cooperation he is referring to would amount to a strategic cooperation between — not only between two countries, but almost like between two allies,” former Turkish opposition lawmaker Aykan Erdemir, a senior fellow at Foundation for Defense of Democracies, told the Washington Examiner.