Ukrainian residents are reporting that their nation's military is massing troops and heavy military equipment along the border with the Crimean Peninsula today, following reports from Russian officials of an attempted infiltration of the peninsula, which the Russians identified as a Ukrainian government incursion, and attempted terrorist plot. A Russian soldier and a member of the FSB security service were reported slain in that weekend incident.

Details of the weekend incident are still emerging, but Russian officials reported gunfire, and having captured several of the plotters, who they suspect of being with Ukrainian intelligence, who were aiming to set up a spy network to attack infrastructure in the peninsula.

Ukrainian military spokesman Andriy Lysenko confirmed the buildup, amid claims of Russian helicopters spotted inside Crimean territory. He added that Ukrainians "should understand that at any minute" a large-scale war with Russia could begin.