Valery Zvegintsev and Vladislav Galkin sentenced to 12.5 years for treason. Case stems from co-authored gas dynamics article published in an Iranian journal. Russian crackdown on scientific community continues with multiple treason convictions. Shiplyuk and Maslov received 15- and 14-year sentences for hypersonic research ties. Zvegintsev and Galkin remain under house arrest until sentences take effect