Russian soldiers carry an Orlan-10 drone in eastern Ukraine.
The regional court in the southern city of Stuttgart found that the main defendant, a 59-year-old head of two companies, had between January 2020 and May 2023 delivered 120,000 components to Russia.
He was sentenced to six years and nine months in jail, while his 53-year-old partner and accomplice were given a suspended sentence of a year and nine months.
She was nominally in charge of another business in the southern state of Baden-Wuerttemberg which was controlled by her partner and used by him to deliver parts to front companies in Russia.
One of the companies the man ran produced the Orlan 10 model of unmanned aerial vehicle used by the Russian army in its ongoing invasion of Ukraine.
After the beginning of the invasion in 2022, the man changed track and began sending the materials to Russia via recipients in third countries.
He earned a total of 875,000 euros ($955,000) from the illegal trade, prosecutors said.
The man, who had been in detention since his arrest in March 2023, was condemned by the court for the "criminal energy" with which he circumvented the EU's sanctions.
The EU first deployed sanctions against Russia over its actions in Ukraine in 2014 but has adopted several further rounds since Moscow launched its full-scale invasion of its neighbour in February 2022.
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