The Ukrainian Security Service (SBU) says it has detained three people who had planned to explode a bomb in the capital Kyiv on August 24, Ukraine's Independence Day.
An SBU statement said that operatives found a homemade explosive device stuffed with nails when they raided premises rented by the suspects. It said they had prevented a "terrorist act."
Unlike its ex-Soviet neighbor Russia, Ukraine has no recent history of large-scale bombings or violent political attacks.
However, the trial of Yulia Tymoshenko, a leader of the peaceful 2004 Orange Revolution and a fierce opponent of President Viktor Yanukovych, has polarized the nation of 46 million.
compiled from agency reports