Russia sentenced eight people to at least 16 years in prison for carrying out arson attacks on behalf of Ukraine’s secret services.

Axar.az reports that citing AFP, the FSB said those sentenced—most of whom were men in their 20s—“carried out arson attacks on transport infrastructure and volunteer organizations, on instructions from Ukraine’s special services.”

They were also plotting attacks on military barracks and were sentenced to between 16 and 22 years in prison on terrorism charges.

The individuals were lured into the “subversive and terrorist acts” by offers of “quick money” spread by Ukraine’s intelligence agency online.

Those sentenced were from six different Russian regions—including some that border Ukraine.