Published 14th June 2018 -

"On June 12th, the day of the Trump-Kim Jong Un meeting, CNN reported on the Russian effort to intercept undersea communication as a reason for new economic sanctions by the USA against certain Russian individuals and institutions. It seems the Russians are finding new ways to gather information."

https:// www.warhistoryonline.com/cold-war/submarine-spying-operation-ivy-bells.html