He said his partner, who was reported to have lost both of her feet, had “catastrophic and irreversible injuries” – while their child sustained “burns, fractures and severe trauma”.
He said: “I remain in intensive care and am only now beginning the long process of recovery”.
The bombing shocked the principality, a haven for the wealthy, which has one of the lowest crime rates in the world.
French investigators identified the attacker as Anastasiia Berezovska, a Ukrainian national who moved to Germany after the Russia-Ukraine war began.
Berezovska was named as Interpol’s chief suspect within days. She fled through France, Italy, Germany and Poland before returning to Ukraine.
Just days after returning, she was found shot dead in a forest near Kyiv after she entered Ukraine on July 1.
Vladyslav Reut, a serving HUR officer, and Vitaliy Zhykovych, a former member of Ukraine’s secret service, the SBU, were arrested by Ukrainian authorities on suspicion of her murder.
The pair had made bank transfers and cryptocurrency payments to Berezovska before her death, which may be linked to the attempt on Iermolaiev’s life.
Ukrainian prosecutors have sought to frame the murder as the work of rogue operators, maintaining that both men had acted without informing or obtaining authorisation from their respective agencies.
Iermolaiev said he viewed the issue differently, suggesting the order for the attack on his family came from above.
In a statement published by his lawyers, he said: “According to the evidence currently available, the conspiracy extended beyond the direct perpetrators and organisers to include serving HUR officers connected to them, including individuals close to the agency’s current and former leadership.”
The statement added: “This was not a warning. It was an attempt to kill not only me, but my family as well.”
Neither Iermolaiev nor his legal representation provided direct evidence of the allegations. Iermolaiev said that the incident was “a matter of international security and trust in public institutions”.
He added: “If serving officers of an intelligence agency used their positions, resources or networks to orchestrate the attempted murder of a family on European soil, then this is no longer merely a crime against my family.”
Iermolaiev said his statement was “directed neither against Ukraine nor against the Ukrainian people”.
After the assassination attempt, prosecutors said that Reut and Zhykovych had driven Berezovska to a wooded area around 60km west of the capital and shot her twice in the back of the head using a Makarov pistol equipped with a silencer.
Reut initially confessed to the killing but told a court in Kyiv on Thursday that his confession was made out of fear for his life.
Ukrainian President Volodymyr Zelenskyy imposed sanctions on Iermolaiev in 2023 for alleged business dealings in Russian-occupied Crimea.
Iermolaiev renounced his Ukrainian citizenship in 2017, obtaining a Cypriot passport. He had described the decision to move to Monaco as motivated by a need for “international protection”.
Estimates of Iermolaiev’s net worth range from £131m ($302m) to more than £606m ($1.3b).
The Telegraph has approached Ukraine’s military intelligence for comment.
Sign up to Herald Premium Editor’s Picks, delivered straight to your inbox every Friday. Editor-in-Chief Murray Kirkness picks the week’s best features, interviews and investigations. Sign up for Herald Premium here.
