Haas Formula One team boss Guenther Steiner on Friday said the future of Haas' Russian driver Nikita Mazepin is uncertain following Russia's invasion of Ukraine. Mazepin signed with Haas as part of a title sponsorship deal with Uralkali, a Russian potash producer owned by his father Dmitry Mazepin. Haas on Friday removed Uralkali logos from its car during pre-season testing.