Russia said on Saturday it would punish Ukraine for using a sea drone to attack a civilian tanker near the Kerch Strait in what it said was a "terrorist act" that threatened the lives of the crew and risked "a large-scale environmental disaster". Both sides said on Saturday that a Ukrainian sea drone full of explosives had struck a Russian fuel tanker overnight near a bridge linking Russia to annexed Crimea, the second such attack in 24 hours. Russian Foreign Ministry spokeswoman Maria Zakharova said that Moscow would retaliate.