GENEVA, June 16 (Reuters) – U.S. President Joe Biden told Russian President Vladimir Putin on Wednesday that certain critical infrastructure should be “off-limits” to cyberattacks, but analysts said his efforts were unlikely to be more successful than previous attempts to carve out safe zones online.

Biden wasn’t explicit about which areas he wanted out of bounds, but spoke of 16 kinds of infrastructure – an apparent reference to the 16 sectors designated as critical by the U.S. Homeland Security Department, including telecommunications, healthcare, food and energy.

“We agreed to task experts in both our countries to work on specific understandings about what is off-limits,” Biden said following a lakeside summit with Putin in Geneva. “We’ll find out whether we have a cybersecurity arrangement that begins to bring some order.”

A senior administration official said that the proposal was focused on “destructive” hacks, as opposed to the conventional digital espionage operations carried out by intelligence agencies worldwide.

Putin’s response to the idea wasn’t immediately clear. In a separate press conference, he said the two leaders had agreed to “begin consultations” on cybersecurity issues but didn’t directly refer to Biden’s proposal.

The threat of destructive hacks aimed at critical infrastructure, a staple of disaster movies where renegade hackers trigger blackouts and mayhem, have long worried experts.

The United States had its first serious taste of what that might mean last month, when ransom-seeking cybercriminals briefly triggered the closure of a major U.S. pipeline network, interrupting gasoline deliveries and sparking panic-buying up and down the East Coast.

Earlier cyberattacks aimed at the Ukrainian power grid and a Saudi petrochemical plant have also drawn concern.

In all those cases, the hackers involved are accused by the United States of either working directly for the Russian government or from Russian territory.Russian officials have repeatedly denied carrying out or tolerating cyberattacks, and Putin on Wednesday made no concessions on the issue.

“We need to throw out all kinds of insinuations, sit down at the expert level and start working in the interests of the United States and Russia,” Putin told reporters.

He then made an insinuation of his own, saying that Russian officials had tracked malicious digital activity coming from the United States.

“We certainly see where the attacks are coming from. We see that this work is coordinated from U.S. cyberspace,” Putin said.

Experts were skeptical that Biden’s proposal would be taken seriously by Putin.

“There’s no indication at all that he actually went along with it,” said Keir Giles, a Russia expert with the London-based Chatham House think tank.

Giles said that grappling with the cyber threat emerging from Russia would require “an outbreak of honesty” on the Kremlin’s side.

“There’s no indication – at least from Putin’s public comments so far – that that outbreak has begun,” Giles said.

The fate of a similar agreement between former U.S. President Barack Obama and Chinese leader Xi Jinping is not encouraging, said Stefan Soesanto, a researcher at the Center for Security Studies at the Swiss Federal Institute of Technology in Zurich.

The 2015 agreement theoretically banned the theft of intellectual property for commercial gain, but many cyber experts that track Chinese hacking say Beijing eventually reneged on the deal.

“Will Biden fare better than Obama/Xi? I don’t think it will,” Soesanto said.