The actual reason was intense pressure exerted by Chinese authorities, including economic coercion. Using coercive means to force a third country to change its sovereign decisions not only undermines aviation safety and violates relevant international norms and practices, it also constitutes a blatant interference in another country's internal affairs.
"Fortunately, our relations with Russia remain good," Anwar Ibrahim, Malaysia's prime minister, told local publication Sinar Harian. "Therefore, the Petronas team can negotiate with them."