Once in office, Biden may consider financial sanctions against Russia, according to Reuters, which cited unnamed sources close to the president-elect. Sources told Reuters that response would need to demonstrate strength, while being careful not to further escalate tensions between the US and Russia.

In a Thursday statement on Thursday, Biden had said his government would make the breach a “top priority” from its first day, but did not at the time name Russia as being responsible for the hack.

“But a good defense isn’t enough; we need to disrupt and deter our adversaries from undertaking significant cyber attacks in the first place. We will do that by, among other things, imposing substantial costs on those responsible for such malicious attacks, including in coordination with our allies and partners,” he said on Thursday.