Russia's Defense Ministry says that over the past week some 2,000 militants, 120 tons of ammunition and some 250 vehicles have crossed into Syria from Turkey.
There are more accusations against Turkey from Lieutenant-General Mikhail Mizintsev, head of the Russian Defense Ministry’s joint military command center.
He says that Turkey has been regularly supplying arms and ammunition to militants in Syria.
Russia's Defense Ministry claims that after crossing the Turkish border, the oil tankers with oil from IS travel to the Batman refinery.
The Defense Ministry says that full information about the oil shipments will be posted on its website after today's press conference.
The Russian Defense Ministry says its satellite photos show 1,722 oil tankers parked in eastern regions of Syria and that Russia is aware of three routes for oil shipments by IS to Turkey.
The Russian Defense Ministry has presented what it claimed are satellite photos of fuel tankers on the Turkey-Syria border.
The Ministry has promised to post these images on its website for public viewing.
Russia's Defense Ministry has said that it will produce proof that Turkey is involved in the IS group's illegal shipments of oil.
Russia made that accusation following the downing last week of a Russian war plane by Turkey near the Syrian border.
It seems that this is a main point of the Defense Ministry's press conference on Russia's military involvement in Syria.
Russian Deputy Defense Minister Anatoly Antonov has said that Turkish President Recep Tayyip Erdogan and his family are "involved in the system of IS oil supply," pro-Kremlin news site RIA Novosti is reporting.
Russia's Defense Ministry is holding a press briefing right now about Russia's military forces and the "war on international terrorism."
Russia's Defense Ministry has begun a press briefing entitled "Russian military forces in the war on international terrorism. New information."
Lt. Gen. Sergei Rudskoy is talking about Russian air strikes degrading oil refining, extraction and storage by "terrorist" groups in Syria.
He says that Russian strikes have degraded 32 oil refining complexes, 11 oil refining factories and 23 oil pumping stations.
The strikes have destroyed 1,080 oil tankers that were transporting oil, he said.
As a result, the illegal circulation of oil has reduced by 50 percent and the "terrorists' income from the illegal business has reduced from $3 to $1.5 million dollars per day."
Tweets from the official account of UK Prime Minister David Cameron setting out his position on IS during a parliamentary debate over whether the UK should join the United States, France and others in air strikes on IS in Syria.
Russian Foreign Minister Lavrov has called Turkey's downing of a Russian war plane near the Syrian border an attempt to derail Syria peace talks in Vienna, due in January.
"It seems that someone really wants to interfere with the political settlement process in Syria and help Islamists prevail in Syria and in the region," Lavrov said in a press conference this morning.
"It is clear that relations between Russia and Turkey in this situation cannot continue on the principle of business as usual, and it is clear that we consider this act by Turkey as against the interests of the war on terrorism."