Mifsud vanished in early November 2017, shortly after the Papadopoulos story broke.
Ive found four different meetings between Papadopoulos and Mifsud:
March 14, 2016 First known meeting. Papadopoulos met Mifsud in Italy approximately one week after officially joining the Trump team.
March 24, 2016 Papadopoulos, Mifsud, Olga Polonskaya and unknown fourth party met in a London cafe.
April 18, 2016 Mifsud introduced Papadopoulos to Ivan Timofeev, an official at a state-sponsored think tank called Russian International Affairs Council.
April 26, 2016 Mifsud claims to have met with high-level Russian government officials who have dirt on Clinton. Papadopoulos told the FBI that Mifsud said the Russians had emails of Clinton and they have thousands of emails.
Although the common story is that Mifsud is a Russian Agent, many ties seem to lead back to UK Intelligence.
Julian Assange put out a Twitter Thread noting the connection between Mifsud and UK Intelligence.
Disobedient Media has done a series of articles on Mifsuds strange background or lack thereof:
All Russiagate Roads Lead To London As Evidence Emerges Of Joseph Mifsuds Links To UK Intelligence.
A Conversation With Chris Blackburn On The Contradictions Surrounding Mifsud.
Chris Blackburn Discusses Legacy Press Coverage Of Joseph Mifsud.
Chris Blackburn had this to say:
If Mifsud is a genuine Russian asset, he has been enabled by the United States most trusted allies. His relationship with senior intelligence and political leaders in Europe should constitute one of the greatest security breaches in decades.
I dont have enough information to make a determination on Mifsud at this point, but I suspect ties with British Intelligence will prove accurate.
Mifsud was just the opening salvo directed at young Papadopoulos.
That leak occurred on July 22, 2016. The FBI opened its counterintelligence investigation on July 31, 2016. Peter Strzok, the FBIs deputy chief of counterintelligence at the time, oversaw the investigation.
Strzok texts suggest he was in London on August 3, 2016:
“How Papadopoulos got the position remains unknown.” He was rewarded the position when the FBI mole targeted him when he wormed his way into the Trump Campaign. Classic Black Ops by The CIA and FBI. I always thought Brennan was the ‘fixer’ in all of this. Who was his boss, Jarret, Clinton or Obama himself? Pure speculation of course, but the tapestry is woven and about to be displayed.