A hooded man holds a laptop computer as cyber code is projected on him in this illustration picture taken on May 13, 2017. (File photo by Reuters)

A senior official from the administration of US President Joe Biden has said that Russia arrested the hacker who was responsible for the massive Colonial Pipeline cyberattack last year.

We understand that one of the individuals who was arrested today was responsible for the attack against Colonial Pipeline last spring, the senior administration official told reporters on Friday.

Russia�s Federal Security Service, the FSB, on Friday announced that it arrested 14 of members of the REvil ransomware gang.

Unknown hackers took down Colonial Pipeline in May last year and disrupted fuel shipments to gas stations all along the US east coast. About a month later, the cyberattack against JBS, the world�s largest meat processing company, prompted a temporary shutdown of all nine of its plants in the United States.

Following the string of high-profile ransomware attacks, including the attack on Colonial Pipeline, the Biden administration has been urging Russia to take action to penalize criminal hackers operating within their borders. The Biden administration attributed the attack to the REvil group last year.

We�re pleased with these initial actions, the senior Biden administration official said.

Our expectation is that Russia announced arrests and Russia would be pursuing legal action within its own system against these criminals, the official added.

The arrests came amid heightened tensions between the US and Russia over Ukraine. US intelligence officials on Friday accused Russia of preparing a false-flag operation in Ukraine to establish the pretext for a potential invasion.

In our mind, this is not related to what is happening with Russia and Ukraine, the senior Biden administration official told reporters on the call Friday afternoon. We�ve also been very clear. If Russia further invades Ukraine, we will impose significant costs on Russia in coordination with our allies and partners.

Russian government spokesman Dmitry Peskov has dismissed as unfounded US media reports accusing Russia of preparing the pretext to invade Ukraine.

The US accuses Russia of planning an invasion of Ukraine amid a military buildup near the border. Moscow rejects the allegation and insists that its deployments are defensive in nature. Recently, Moscow has been especially unsettled by the prospect of Ukraine being admitted to NATO and has warned of serious measures to counteract that scenario.

Last month, the Russian government put forth a number of security guarantees that it said it wanted from the West, in particular about Ukraine, and offered to take certain measures in exchange.