Four years after the attacks, Serhii K will appear in court accused of a plot to destroy Russia's gas pipelines to Germany.

Simbarashe Kundizeza was responding to an accusation that has caused an uproar on social media.

The Ukrainian president says the ballistic missile strikes came with "no early warning from our partners".

Prosecutors say the device, wrapped in toilet paper, was found inserted in a USB port on the back of a TV in an executive conference room.