The court did not disclose the convicted man’s identity or provide details of the charges against him when announcing the verdict.
Two other Ukrainian defendants were acquitted.
German authorities detained the three men in May 2025 in Konstanz, Cologne and the Swiss canton of Thurgau.
Germany’s Federal Prosecutor’s Office alleged that they were involved in preparations for sabotage targeting transportation infrastructure used by parcel delivery companies.
Investigators said the defendants sent two parcels containing GPS trackers to Ukraine through a Ukrainian postal service in March 2025.
Prosecutors alleged that the men may have received the assignment from Russian intelligence through intermediaries in Mariupol.
The aim was to study the routes and operations of German delivery services in preparation for subsequent attacks, police said.
The indictment alleged that the next stage of the plan involved sending parcels containing incendiary devices designed to ignite while in transit.
Prosecutors said the attacks were intended to cause damage and spread fear among the public.
Investigators said the three men had agreed to carry out the plan but were detained while preparing for the potential attacks.
Federal prosecutors had sought prison sentences ranging from two years and nine months to four years and three months. Defense attorneys had called for all three defendants to be acquitted.
Russia-linked sabotage cases involving Ukrainians in Europe
The case is not the first in which Ukrainian citizens have been accused of involvement in alleged sabotage operations in Europe.
In June, a British court sentenced Ukrainian citizen Roman Lavrynovych to seven years in prison for setting fire to a vehicle and properties linked to then-Prime Minister Keir Starmer.
In March, Lithuanian authorities sent to court cases against five people, including two Ukrainians, suspected of attempting a terrorist attack allegedly organized on instructions from Russian intelligence.