As a result of these cyber attacks, banks experience difficulty in servicing customers and performing banking operations, the NBU said.

All the financial market participants have taken steps to tighten security measures to counteract these hacker attacks.

Read alsoPoroshenko: No chance for Russia's cyberwarfare against UkraineThe NBU is confident that the banking infrastructure is securely protected from cyber attacks and any attempts to perform hacker attacks will be efficiently warded off.

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The NBU closely monitors developments and inform market participants about the cyber security measures taken to protect the banking system.