Ukraine’s security services said yesterday they foiled a Russian plot to assassinate President Volodymyr Zelensky and other top military and political figures. They said two Ukrainian colonels have been arrested on suspicion of treason. Via The New York Times: The Ukrainian domestic intelligence agency, the S.B.U., said in a statement that the plot had involved a network of agents — including the two colonels — that was run by Russia’s Federal Security Service, or F.S.B., the main successor to the K.G.B.