It therefore seem wrong what Bellingcat claims in the above piece. Abramovich did not attend the peace talks between Ukraine and Russia on March 3.

It may well be though that after the peace talks in Belarus were held some of the Ukrainian delegation, including Rustem Umerov, had a meeting with Abramovich in Kiev.

Later it is said three of them went from there to an apartment in Kiev where they suffered some symptoms.

Bellingcrap is of course asserting, with zero evidence, that Russia was involved in that:

Sources told WSJ they blamed the suspected poisoning attack on hard-liners in Moscow who wanted to ruin talks to end the war. The victims meanwhile said they were not aware of who would have an interest in the attack. Bellingcat investigator Christo Grozev, who was part of the team that concluded the Kremlin had poisoned Russian politician Alexei Navalny with a nerve agent in 2020, said he had seen the effects of the poisoning on Abramovich and the other negotiators.

'It was not intended to kill, it was just a warning,' Grozev said.

Who was the fourth member of the meeting who did not suffer symptoms? Would he not be the most suspect for poisoning of the others participants? Was he connected to Moscow hardliners?

Was it the peace negotiator who shortly thereafter suffered something much worse than curious poisoning symptoms. Something which is left out of the current reporting.

On Saturday March 5 the Kiev Independent reported:

According to Ukrainska Pravda sources, a member of the Ukrainian negotiating delegation that met with Russia, was shot dead by the Security Service of Ukraine officers as they were trying to detain him. The man was allegedly Denys Kirieiev, a former deputy chairman of Oschadbank. The SBU had “strong evidence” he was leaking information to Russia. Below is a picture of Denys Kireev. He is not in the picture of the Ukrainian delegation in the March 3 talks shown above.

If you're talking about Kireev... He was assassinated...