Ukraine head of cybersecurity Victor Zhora says the world needs "efficient legal instruments to confront cyber terrorism."

Senators rebuked the Department of Defense for holding up assistance to international efforts aimed at investigating and trying war crimes committed by Russian forces in Ukraine.

A torrent of water burst through a massive dam on the Dnipro River that separates Russian and Ukrainian forces in southern Ukraine on Tuesday, flooding a swathe of the war zone, forcing villagers to flee and prompting finger-pointing from both sides.

By Matthias Williams, Mark Trevelyan and Gloria Dickie LONDON (Reuters) -The breach of a huge dam on the front-line Dnipro river has muddied the picture for a much-awaited Ukrainian counteroffensive against Russian invaders and threatens an environmental disaster for civilians living in the war zone.

Germany blamed Russian President Vladimir Putin for the destruction of the Kakhova dam in Ukraine, and was joined by other European NATO members in denouncing it as a “war crime.”