"Russia's FSB has thwarted the preparation of a terrorist act by accomplices of Ukrainian intelligence services in the Moscow Region," FSB said in a statement.
Two Russian nationals were spotted near a cooperative garden "retrieving an improvised explosive device from a weapons cache in preparation for a subversive terrorist attack," the statement read. Security officers also found Makarov pistols and ammunition, a ready-to-use improvised explosive device, and communication equipment containing correspondence on the planned terrorist attack at the site.
"During arrest, they [plotters] resorted to armed resistance and were neutralized by return fire," FSB said.
A criminal case was launched into collusion to illegally acquire, transfer, store, transport or carry explosive substances or explosive devices, the statement read.