By Jonathan Saul LONDON (Reuters) -London’s marine insurance market on Monday added all of Russia’s waters to its list of areas deemed high risk, an advisory showed, which is likely to raise the cost of shipping and adds to the logistical pressures on Moscow. Guidance from the Joint War Committee, which comprises syndicate members from the Lloyd’s Market Association (LMA) and representatives from the London insurance company market, is watched closely and influences underwriters’ considerations over insurance premiums. Following Russia’s invasion of Ukraine on Feb. 24, the JWC last month added…