dubai, April 28 -- A superyacht linked to sanctioned Russian billionaire Alexey Mordashov sailed through the Strait of Hormuz on Saturday, shipping data showed, one of very few vessels to transit the blockaded shipping lane at the heart of the US-Iran conflict. Nord - a 142-metre yacht worth over $500 million - left a Dubai marina on Friday, crossed the strait on Saturday, and arrived in Muscat early on Sunday, according to data on the MarineTraffic platform. It is not clear how the multi-deck pleasure vessel gained permission to use the route. A representative of steel magnate Mordashov declined to comment on Monday. Just a few, mainly merchant vessels, have been passing daily through the crucial waterway at the entrance to the Gulf as Was...