<p>Russia's Federal Security Service (FSB) said on Thursday it had detained a serviceman in Siberia for having allegedly passed state secrets to Ukraine.</p>.<p>The serviceman, from Russia's Strategic Missile Forces, was detained in the Siberian city of Barnaul, some 2,900 kilometers (1,800 miles) east of Moscow, as he was walking out of a grocery store, FSB footage carried by Russian news agencies showed.</p>.<p>In a statement carried by Russian agencies, the FSB said the serviceman had allegedly passed state secrets to the Main Intelligence Directorate of Ukraine's defence ministry.</p>.<p>It did not provide further detail on the nature of the information that had allegedly been passed.</p>.<p>It said a criminal case had been opened for state treason. If convicted, the serviceman could face up to 20 years in jail.</p>.<p>Relations between Russia and Ukraine have soured since Moscow annexed Crimea in 2014 and pro-Kremlin separatists seized a swath of eastern Ukraine.</p>.<p>Russia has spent heavily to integrate Crimea into its territory, and it has been the focus of espionage and military tensions since its annexation.</p>
<p>Russia's Federal Security Service (FSB) said on Thursday it had detained a serviceman in Siberia for having allegedly passed state secrets to Ukraine.</p>.<p>The serviceman, from Russia's Strategic Missile Forces, was detained in the Siberian city of Barnaul, some 2,900 kilometers (1,800 miles) east of Moscow, as he was walking out of a grocery store, FSB footage carried by Russian news agencies showed.</p>.<p>In a statement carried by Russian agencies, the FSB said the serviceman had allegedly passed state secrets to the Main Intelligence Directorate of Ukraine's defence ministry.</p>.<p>It did not provide further detail on the nature of the information that had allegedly been passed.</p>.<p>It said a criminal case had been opened for state treason. If convicted, the serviceman could face up to 20 years in jail.</p>.<p>Relations between Russia and Ukraine have soured since Moscow annexed Crimea in 2014 and pro-Kremlin separatists seized a swath of eastern Ukraine.</p>.<p>Russia has spent heavily to integrate Crimea into its territory, and it has been the focus of espionage and military tensions since its annexation.</p>