They visit UK waters about every couple of weeks by sea or air, their ships regularly sail up the English Channel, and usually have an escort from the RN, this has gone on through and since the cold war, Their warplanes regularly fly into the North Sea from the north, and the RAF monitor them out of Lossiemouth, and Conningsby, if they come to close we will our Eurofighters to escort them away.
Oh, and one of our "spy" planes has just been spying on Kaliningrad, and another is investigating something in the North Sea along with a German AF plane.