sanctions have caused the value of the rouble to plunge. but for those who back moscow's onslaught in ukraine, many of them claim they couldn't care less about global corporations disappearing from the russian market. the era of post—soviet colonisation by the west started with the arriving of mcdonald's to russia, and the era of sovereign greater russia starts with mcdonald's leaving it. so, have a nice trip. for the moment, moscow is defiant, uncompromising, unapologetic. but russia is intricately connected to the global economy. isolation will hurt. steve rosenberg, bbc news, moscow. you're watching newsday on the bbc. still to come on the programme... we'll tell you how the world's most famous undiscovered shipwreck — sir ernerst shackleton�*s endurance — has now been found.