By Tom Balmforth and Gleb Stolyarov

MOSCOW (Reuters) – The Kremlin said on Tuesday it saw no need for now to investigate the circumstances leading up to opposition politician Alexei Navalny’s grave illness and that a German clinic’s initial diagnosis of poisoning was not yet conclusive.

German Chancellor Angela Merkel on Monday called on Russia to investigate the suspected poisoning and to hold the perpetrators accountable after German doctors found indications of a toxic substance in his body.

But Kremlin spokesman Dmitry Peskov said the German clinic had not conclusively identified the substance behind Navalny’s illness and that it was unclear why German doctors were “rushing” to use the word poisoning.

“There must be a reason for an investigation. For the moment, all you and I see is that the patient is in a coma,” Peskov told reporters on a conference call.

He added that if poisoning was definitively established as the cause, then an investigation would be launched.

“If the substance is identified and it is determined it was a poisoning, then, of course, this will be a reason for an investigation,” Peskov added.

Demands for a probe are intensifying, with Sweden’s Foreign Minister Ann Linde on Tuesday saying on Twitter that the “circumstances regarding the suspected poisoning of Navalny need to be clarified by independent investigation.”

Late on Monday, top European Union diplomat Josep Borrell also asked Russia to investigate.

CHOLINESTERASE – OR NOT

Navalny, an outspoken opponent of President Vladimir Putin, was airlifted to Germany for treatment on Saturday after collapsing on a plane while flying back to Moscow from Siberia.

German doctors treating Navalny at a Berlin hospital said on Monday that medical examinations indicated poisoning with some kind of cholinesterase inhibitor, although the specific substance is not yet known.

Russian health officials contradicted that diagnosis, saying Navalny had tested negative for cholinesterase inhibitors when he was hospitalised in Omsk last week.

Peskov said doctors at the Omsk hospital had battled for three days to treat Navalny and had possibly saved his life.

“We don’t understand why our German colleagues are rushing with the word poisoning,” he said.

Navalny has been a thorn in the Kremlin’s side for more than a decade, exposing what he says is high-level graft and mobilising protests. He has been repeatedly detained for organising public meetings, sued over corruption investigations and barred from running in the 2018 presidential election.

Peskov said any suggestions that Putin was somehow involved in Navalny’s illness was “hot air”, which the Kremlin would not take seriously.

Germany said on Monday Navalny was being guarded due to concerns for his safety. Navalny’s wife was filmed entering the hospital on Tuesday but declined to speak to journalists.

(Reporting Tom Balmforth and Gleb Stolyarov; additional reporting by Darya Korsunskaya and Anton Zverev; editing by Sujata Rao, William Maclean)

PHOTO: Julia Navalny leaves the hospital where her husband is being treated for poisoning in an attempted assassination Reuters