At the end of May, when an ISIS fighter returning home from Syria carried out a deadly attack at the Jewish Museum in Brussels killing reportedly 4, the Europe got to the fact that the violence doesn’t stop at its external borders .
The Islamic States of Iraq and al-Sham (SIS) prevailed in recruiting more people, and obtain weapons and money from different sources. This concerned the Western states that once supported and armed the group against the legal government of Syria and Iraq.
The ISIS terrorist group which has now organized a terrorist army seems to have plan to tangle with the West.
A senior U.S. official, who spoke to CNN on condition of anonymity, said that events in Syria and Iraq are dominating discussions in the counter-terrorism community. The official said ISIS was now focused on Iraq, but "the big concern" was that it will shift its attention to the West — identifying, recruiting and training Western individuals to return to their homelands as hardened, combat-trained extremists.
European governments estimate that at least 1,400 of their citizens are fighting as ISIS jihadists but the true numbers may be higher—one British parliamentarian said that as many as 1,500 Britons have fought in Syria, compared to an official estimate of 500. [ 2] Authorities in France believe some 800 French nationals have travelled to Syria, or intend to. Analysts believe as many as 100 American citizens have made the trek.
on the other side, the Mujahedin Khalq terrorist group which has already been active supporting the extremists in the region or elsewhere, didn’t hesitate hailing and supporting blatantly the so called Islamic government of Iraq and the Levant(ISIL/ISIS), despite the shocking news and gruesome photos of the mass killings and savage crimes the ISIS commit in Iraq and against ordinary people. Instead the group supporters in the European Parliament downplayed the horrors of ISIS’ actions claiming the violent acts were “part of a popular uprising” against Prime Minister Nouri al-Maliki. 
The military equipments and armored vehicles of the MKO reportedly were seen as being used by the elements of ISIS.
In their annual gathering in Paris to hail their vicious past, Maryam Rajavi the so called president elect of the MKO rejoiced over the progress achieved by the ISIL.
Meanwhile, the French Foreign Ministry strongly condemned the terrorist Mujahedin-e Khalq Organization stating:” "France has no contact with the Organisation of the People’s Mujahideen of Iran which is known for resorting to violence,"
Dr. Webster Griffin Tarpley, an author and historian from Washington, in an interview by PressTV to discuss the reason behind the France recent condemnation of the MKO says:” When you see a group like ISIS which is similar in many ways to the terrorists of the MEK, obviously there is a feeling in the MEK I would guess that they have got to get involved, that they have got to contribute, they have got to make themselves heard or they are not going to get the funding that they are accustomed to getting”.
The Mujahedin Khalq Organization’s support and mutual cooperation to the extremist groups in the region seems to be – -in addition to its terrorist nature -based on the fact that the group depends on crises to secure its survival.
While Syria and Iraq experiencing unrest the MKO has been active supporting the insurgents and saboteurs.
In late august 2012, a number of MKO terrorists detained by the Syrian government confessed that the MKO is training the militants on Turkish soil near the border with Syria. 
After the downfall of Saddam Hussein the MKO has been active in supporting Baath Party elements and other terrorist and extremist groups against the legal government of Iraq who wants the MKO out of the country.
Anyway, the group’s supports and mutual services to terrorists and extremists haven’t brought anything good for them. It may lose its years-long stronghold in France, as it did in Iraq; Camp Ashraf.
By A. Sepinoud
 Cruickshank, Paul , Lister, Tim, CNN, Europe faces ‘greatest terror threat ever’ from jihadists in Iraq and Syria , June 19, 2014
 Abi-Habib, Maria, Jihadists Step Up Recruitment Drive, Wall Street Journal, June25,2014
 Cruickshank, Paul, Lister, Tim, ‘Foreign Legion’ in Iraq and Syria may bring jihad to West, CNN, June 17, 2014
 Mamedov, Eldar, European MEK Supporters Downplay ISIS Role in Iraq, LobeLog, May 6, 2014
 Voltarie Network, International meeting for ISIL in France, July1,2014
 ISIL terror alarms France to MKO threat: Analyst, PressTV, June30, 2014
 PressTV , MKO terrorists active in Syria under guise of medics ,May4, 2013