By Tobias Carroll Since Russia began its invasion of Ukraine earlier this year, a number of governments have responded by seizing the assets of Russian oligarchs with ties to Vladimir Putin’s government. This has included several high-profile seizures of yachts across the world — and the phenomenon of some massive yachts heading to locations far from land (and, one assumes, far from law enforcement). Now, the plot — as they say — has thickened. A report from The Observer notes that several yachts with ties to Russian oligarchs have stopped communicating with systems used to monitor boats trave…