ADVERTISEMENTFrance has launched an investigation into a Russian-linked oil tanker for "serious offences," President Emmanuel Macron said on Wednesday. Authorities have opened a probe into the Benin-flagged Boracay vessel, which is named on a list of shadow fleet ships and subject to EU sanctions. "There were some very serious offences committed by this crew, which justify the current judicial procedure," Macron said at an EU leaders' defence summit in Denmark. Macron however stopped short of confirming reports of a link to the tanker and the airspace violations, saying he would "remain very careful." Built in 2007 and known as Pushpa and Kiwala, the Boracay is currently anchored off Saint-Nazaire in western France.