russia's rich and powerful, as they fled to friendlier waters like the yacht graceful, believed to be one of at least two yachts belonging to vladimir putin, which made it safely to a russian harbor on february 10th, before anyone could impose sanctions and impound it. now, since the invasion, russian-linked yachts also started to go dark. they're basically turned off their transponders and literally disappeared off the map. you cannot seize what you cannot see. and now, the same thing is reportedly happening with russian oil tankers. a company called windward maritime ai, that provides intel on shipping to a variety of customers, noticed an uptick in the number of russia-affiliated oil shipments where the ship's transponders just stopped broadcasting their location. so-called dark activity among russian affiliated crude oil tankers is up by 600% compared with before the war began, according to windward ai.