The Investigative Committee said that Ms Savchenko was detained after crossing into Russia disguised as a refugee. However, Ukraine’s foreign ministry said that was a ridiculous claim because she had earlier been held by “terrorists” – meaning pro-Russian separatists in eastern Ukraine.Ms Savchenko had been kidnapped and “trafficked” to Russia, the ministry said, calling for her immediate release. “This is yet another proof that terrorists are planning and committing their crimes on the territory of Ukraine in close cooperation with the secret services of the Russian Federation,” it added.