21 July 2021 NPS Launches Center on Combating Hybrid Threats to Address Hybrid Warfare MONTEREY, Calif. - On November 25, 2018, a Russian commercial cargo ship suddenly parked itself across the narrow Kerch Strait on the Crimea, blocking three Ukrainian Navy vessels sailing in international waters from reaching the port of Mariupol on the Sea of Azov. When they tried to turn back, the...