Russia's Federal Security Service (FSB) said on Wednesday it had arrested seven people connected with Ukrainian intelligence and accused them of planning "a series of high-profile sabotage and terrorist acts" in Russian-annexed Crimea.
In a statement, the FSB said the group had planned attacks against Russian-installed officials including local governor Sergei Aksyonov. It said it had seized explosives identical to those used to attack railways in the peninsula in February.
In a statement, Aksyonov said the same group was behind both alleged incidents. He said, without providing evidence, that there was no doubt that the Ukrainian government was behind them.