The latest such case is the death of Russian businessman Nikolay Glushkov on March 12, after the apparent attack on the Skripals, Yakovenko said.
Britain says they were poisoned with the nerve agent Novichok and blames Russian Federation.
The Skripals were targeted by a nerve agent attack that left both of them critically ill for weeks.
"We therefore continue to judge that only Russian has the technical means, operational experience and motive for the attack on the Skripals and that it is highly likely that the Russian state was responsible", he said.
The poisoning of ex-GRU Colonel Sergei Skripal and his daughter Yulia in Salisbury, UK on March 4 was quickly blamed on Russian Federation by UK Prime Minister Theresa May, leading to a sharp deterioration in diplomatic ties.
It goes on to say that "during the 2000s", Russian Federation created a special unit to develop chemical weapons for use as tools in state-sponsored attacks and to "train personnel from special units in the use of these weapons". The strongest concentration of the Novichok nerve agent found in the Salisbury incident was on the front door of Mr Skripal's home.
The claims come after the worldwide Organisation for the Prohibition of Chemical Weapons backed Britain's assertion the Skripals were poisoned by Novichok - a military grade nerve agent developed by the Russians in the 1980s.
The claims come after the worldwide Organisation for the Prohibition of Chemical Weapons backed Britain's assertion the Skripals were poisoned by Novichok.
Global tests confirmed that a Novichok nerve agent was used. He stressed that Russia's criticism of the way the United Kingdom chose to engaged the OPCW in the case did not amount to doubting the merits of the report.
He questioned the authenticity of a statement issued by Ms Skripal through the Metropolitan Police saying she did not want to meet Russian officials.
However, the OPCW did not explicitly name Novichok in its published summary, nor did it say where the chemical may have come from.
On Friday, Russian Foreign Minister Sergey Lavrov said the report does nothing to back the British allegations that Moscow was behind the attack, which Moscow denies.
"Normally, you don't worry about some impurities because they don't get in the way of the major task that you're using the chemical for, which is to poison someone".
Yulia was discharged from Salisbury District Hospital this week while her father remains in the hospital.