The radical Islamist group Isis (now known as Islamic State) has released a new video threatening Russian President Vladimir Putin that it plans to come to Russia and "free Chechnya".
The video footage, believed to be filmed in the Taqba airbase captured from Syrian government forces in Raqqa, shows an IS fighter in a military jet.
"This message is for you, Vladimir Putin! These are the aircraft you sent to Bashar [Assad], and we're going to send them to you. Remember that!" he said.
"This is Russian technology," said a militant with a Russian voice, according to The Moscow Times.
"We will with the consent of Allah free Chechnya and all of the Caucasus! The Islamic State is here and will stay here, and it will spread with the grace of Allah!" another militant warns.
The militant then addressed Putin, adding: "Your throne has already been shaken, it is under threat and will fall with our arrival [in Russia] ... We're already on our way with the permission of Allah!"
While the terror group has declared war on the United States for its air-strike campaign in northern Iraq, Russia has provoked its ire for supporting and supplying the Assad regime. The militants in the video refer to Assad as a "pig".
Russia's security services believe hundreds of militants from the Caucasus regions have fled to the Middle East to fight with the group.
One of the group's prominent military commanders, Omar al-Shishani, is a Georgian-born ethnic Chechen. With a deep hatred for the Kremlin, he played a role in the 2008 Russia-Georgia War, spying on Russian tanks and relaying their positions back to Georgian artillery.
Some social media users have called Shishani "Tarkhan the Rodent" in reference to his real name, Tarkhan Batirashvili. Shishani itself translates as "the Chechen" in Arabic.
Chechen leader Ramzan Kadyrov wrote on Instagram the group's warning was a "childish threat".
In the post that showed Kadyrov with a shirt emblazoned with Putin's face, he said the Islamist militants were "saying only what their masters in the West's security services were telling them to say".
"These jerks have nothing to do with Islam. They are the blatant enemies of Muslims all over the world. Naive people decided to threaten Chechnya and all of Russia with two aircraft. They can sit in 2,000 aircraft and still not make it to Russia," he wrote.
"I declare, with all responsibility, that whoever gets it into their heads to threaten Russia and speak the name of President Vladimir Putin will be destroyed as soon as he says it." He added: "We won't even wait for him to sit at the helm of a plane."
Before the release of the video, Russia's Defence Ministry condemned the "horrific crimes" committed by the group and requested that China and Western nations battle to end IS's campaign across the Middle East.