Russia has unveiled what it describes as proof that Turkish president Recep Tayyip Erdogan and his family have benefited from the illegal smuggling of oil from Isis-held territory.
Moscow defence ministry officials released satellite images they claim shows columns of tanker trucks loading with oil at an installation controlled by Isis in Syria, before crossing the border into Turkey.
Footage was also sent out by the Kremlin that purported to show a flow of lorries crossing the Turkey-Syria border with no restrictions at the Reyhanli checkpoint.
Russia officials did not specify what direct evidence they had of the involvement of Mr Erdogan and his family, an allegation the Turkish president has vehemently denied.
It is the latest salvo in the war of words between the two countries, after Turkey shot down a Russian military plane near to its border with Syria last month.
An undated frame grab taken from a video presentation by the Russian Defence Ministry is seen during a briefing in Moscow
“According to information we’ve received, the senior political leadership of the country – President Erdogan and his family – are involved in this criminal business.”
Mr Antonov admitted that he may have been “too blunt” in levelling the allegations, adding: “In the West, no one has asked questions about the fact that the Turkish president’s son heads one of the biggest energy companies, or that his son-in-law has been appointed energy minister. What a marvellous family business.”
On Tuesday, US President Barack Obama said Turkey had made progress in sealing its border with Syria, but Islamic State was still exploiting gaps to bring in foreign fighters and sell oil.