Nebius is a vertically integrated cloud provider focusing on AI and high-performance computing. It is a carve-out of the previous Russian tech firm Yandex, following the Russian sanctions since the Ukraine-Russia war. Nebius designs and operates its own data centers and servers across Europe and the US, with a total capacity of several hundred megawatts. In September 2025, Microsoft became a major Nebius client under a multiyear $17 billion revenue agreement to provide computing capacity.