Ukraine’s defense ministry and two banks were subject to cyberattacks with their online networks overwhelmed by the attacks.
Ukraine’s information security centre pointed the finger at Russia.
“It is not ruled out that the aggressor used tactics of little dirty tricks because its aggressive plans are not working out on a large scale,” said the Ukrainian Centre for Strategic Communications and Information Security, in a statement.
In the past Kyiv had blamed Moscow for similar actions.
Russia has amassed more than 100,000 troops on its border with Ukraine raising fears of a potential invasion in the West, which has been denied by it.
The type of cyberattack in this instance is known as distributed denial-of-service, whose scale is not immediately clear.
A message on Ukraine’s defence ministry website states it was under maintenance. In a tweet the ministry said, its website was apparently under a cyberattack and it was working on restoring access to it.
Confirming the cyberattack Oshadbank said it resulted in slowing down of some of its systems.
In a statement the strategic communications centre said, Privatbank users had reported problems with payments and its banking app reported disrupted in service.
Privatbank did not immediately respond to requests for comments.
In a statement, Cloudflare, a prominent provider of denial-of-service protection, said that it had seen no evidence of “large DDoS activity” in Ukraine against its data centres or customers there.
“From our perspective today hasn’t seen unusual attack traffic against us or our customers on Ukraine,” said Cloudfare.