Kyiv police on Wednesday arrested a man who entered Ukraine's main government building and threatened to detonate a grenade, the Interior Ministry said.
The man was identified as Vladimir Prokhnich, a veteran of the Ukrainian Armed Forces.
The police arrived on the site, carried out an operation and neutralized him.
Head of the National Police Igor Klymenko told a news conference that Prokhnich was twice wounded while serving in Donbas, eastern Ukraine. He was said to be dissatisfied with the work of state bodies.
A criminal case has been opened and the perpetrator could face up to 15 years in prison, he added.