The Ukrainian government has accused Russia of being behind Friday's cyber-attack on dozens of official websites.

About 70 government websites were temporarily down, in the largest such attack on Ukraine in four years.

Before the sites went offline, a message appeared warning Ukrainians to "prepare for the worst".

The US and Nato condemned the attack and have offered support to Ukraine.

russia was behind the hack, he said : "i am 99.9 % sure."

they alleged that the attacks against ukraine.

Nato said it would soon be signing an agreement with Ukraine on enhanced cyber cooperation, which would give it access to the alliance's malware information sharing platform.

"ukrainian websites is consistent with previous events, but it's also odd.

The websites contained a message in Ukrainian, Russian and Polish, saying that Ukrainians' personal data has been leaked into the public domain.

it's your past, present and future." the message read, in part.

Ukraine's State Service of Communication and Information Protection said that no personal data has been leaked.

"We are going to mobilize all our resources to help Ukraine cope with these cyberattacks," Borrell said.

Hybrid or asymmetric warfare is an established part of modern conflict and Russia has proved itself adept at attacking the cyber realm as well as the physical.

During its 2008 invasion of Georgia, government websites were forced offline by attacks from Russia.

In a message to the Guardian, the foreign ministry's spokesperson, Oleg Nikolenko, said : "As a result of a massive cyber-attack, the website of the ministry of foreign affairs and other government agencies are temporarily down."

Officials said it was too early to draw any conclusions but they pointed to a "long record" of Russian cyber assaults against Ukraine, with the attack coming after security talks between Moscow and the US and its allies this week ended in stalemate.

Suspected Russian hackers left a message on the foreign ministry website, according to reports.

"be afraid and expect the worst.

Nato's secretary general Jens Stoltenberg and Josep Borrell, the EU ’ s top diplomat, condemned the attacks.

sadly, we knew it could happen," he said : "it can happen on any day.

I can ’ t blame anybody as I have no proof.

Sweden's foreign minister, Ann Linde, said the west must stand up to any Russian aggression.

On Friday Russia's foreign minister Sergei Lavrov said Moscow would not wait indefinitely for a response.

the kremlin has demanded an assurance ukraine and georgia will never join nato.

The US embassy in Moscow had no immediate comment.

Thus far, the Kremlin has made little effort to curb hacks on western targets by Russia-based cyber-criminals.

ukraine has endured a war with russia for the past eight years, since moscow annexed crimea and backed an insurgency in the east of the country.

A repeat attack happened in 2016.

Again, it depends only on one person- [ Russian President ] Vladimir Putin."

They "should have been asleep at that time as it was 3am", he said, speaking at the National Security and Defence Council building, within a well-guarded compound in Kyiv.

It came as Russia continued to mass some 100,000 troops on Ukraine's borders despite a week of high-stakes diplomacy with the United States and other NATO allies aimed at trying to defuse the crisis but which, as feared, failed to produce any breakthroughs.

"You have your own business to take care of, a huge bother awaits you there.

He added : "Ukrainians are peaceful, we have never ever attacked anyone.

He said Ukrainian cyber defences are usually sufficient to deal with hacks but no country is immune.

The websites of the country's Cabinet, seven ministries, the Treasury, the National Emergency Service and the state services website, where Ukrainians' electronic passports and vaccination certificates are stored, were temporarily unavailable Friday as a result of the hack.

Moscow says it has no plans to attack and rejects Washington's demand to pull back its forces, saying it has the right to deploy them wherever necessary.

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