https://www.theguardian.com/world/2016/aug/10/russia-accuses-ukraine-of-armed-crimea-incursion
Russias security service said it had thwarted terrorist attacks in Crimea by Ukrainian military intelligence and beaten back an armed assault by Kievs forces.
The FSB said one of its officers was killed in armed clashes while arresting terrorists on Saturday night while a Russian soldier was killed in clashes with sabotage-terrorist groups sent by the Ukrainian defence ministry on Monday.
Yuriy Tandit, an adviser to the head of Ukraines security agency, denied the allegations, telling Interfax-Ukraine news agency that Kiev had no intention of taking back the territory by force.
The Organisation for Security and Cooperation in Europe (OSCE) monitoring the frontier between mainland Ukraine and Crimea which Russia annexed in 2014 did not report the incident.
But it said traffic was halted this week and border guards appeared to be on heightened alert.
In its statement the FSB which controls Russias borders said it had foiled terrorist attacks on the territory of Crimea prepared by the intelligence directorate of the Ukrainian defence ministry.
It said the aim of the sabotage and terrorist attacks was to destabilise the social and political situation before elections in September in Russia and Crimea.
The security agency said several people had been detained, including a Ukrainian military intelligence officer, and a cache of explosives was discovered in raids on Saturday and Sunday.
On the night of 8 August 2016 special operations forces from the Ukrainian defence ministry carried out two more attempts to make a breakthrough by sabotage-terrorist groups, it said.
The assault included massive firing from the side of the neighbouring state and armoured vehicles, but was beaten back by the Russian authorities, the statement said.
Russia seized the Black Sea region from Ukraine in March 2014 after the Kremlin-backed president Viktor Yanukovych was ousted by pro-EU protests in Kiev.
The move shattered ties between the two ex-Soviet neighbours and resulted in relations between Moscow and the west plummeting to their lowest point since the cold war.
The FSB said it had stepped up security measures around the peninsula following the alleged incidents.