The Kremlin said on Wednesday it hoped opposition politician Alexei Navalny's illness would not damage Russia's ties with the West and that it was keen to find out why he fell ill despite declining to open an investigation over the incident.
Navalny is in a medically induced coma in a Berlin hospital where he was airlifted on Saturday after collapsing during a flight. The German clinic said its initial medical examination pointed to poisoning, though Russian doctors who had treated Navalny in a Siberian hospital have contradicted that diagnosis.
Germany, the United States and other countries have called on Russia to investigate the circumstances that led to Navalny's illness but Kremlin spokesman Dmitry Peskov told reporters the diagnosis so far is inconclusive.
Replying to a question on the possible worsening of relations between Moscow and the West, Peskov said: "Of course we would not like this (to happen), that's the first thing."
"Secondly, there is no reason for that."
His comments come a day after the speaker of Russia's lower house of parliament said a committee would launch a probe to determine whether foreign forces had played a hand in Navalny's illness in order to fuel tensions in Russia.
Asked about the parliamentary speaker's theory about foreign forces, Peskov said if poisoning was confirmed and the substance definitively identified, "then there would be reason to consider whom it benefits".
"We are no less interested than anyone else to know what led to the coma," he added.
Earlier, a senior ally of Navalny said he believed only President Vladimir Putin could have authorised the suspected poisoning of the outspoken Kremlin critic. Ivan Zhdanov, the director of Navalny's Anti-Corruption Foundation (FBK), did not provide any evidence for the claim.
"He hates what the FBK does too much, exposing him and his entourage," Zhdanov said.
The Kremlin has dismissed as "hot air" and untrue any suggestion Putin was somehow involved in Navalny falling ill.
Cholinesterase inhibitors, named by German doctors as a possible cause of Navalny's illness, are chemical compounds used in certain medicines. Nerve gases and "Novichok" — the substance used in 2018 to poison former Russian spy Sergei Skripal in England — are also cholinesterase inhibitors.
Navalny has been a thorn in the Kremlin's side for more than a decade, exposing what he says is high-level graft.
However, he has said he believes his death would not help Putin. Reuters reported he had told supporters just before his illness that his death would "turn him into a hero"
The pressure on Russia following Navalny's illness has hit Russian markets, with the rouble tumbling on Wednesday to four-year lows against the euro