Says special units on watercraft landed on shore in the area of the Olenivka and Mayak settlements
Russia seized Crimea in 2014, eight years before launching its full-scale invasion of Ukraine
Soviet-era canal was built to channel water from the River Dnieper to arid areas of Ukraine
US State Secretary says Moscow has stepped up planning for potential military action in the country
NATO, US warn Moscow it would pay a high price for any new military aggression
Says deal with Ukraine shows British military activities are expanding near its borders
The fire broke out when one vessel was transferring fuel to the other, driving both crews to jump overboard
Kiev imposed martial law for 30 days in 10 regions that border Russia, the Black Sea and the Azov Sea
Moscow accuses sailors of crossing illegally into Russian waters and ignoring warnings from its border guards
Officials are treating the incident as a terrorist attack in which many of the victims are teenage pupils