The Ukrainian hacktivist group CyberBerkut has blocked two German government sites. They are angry that Ukraine's Prime Minister Arseny Yatsenyuk plans to use billions from the EU to fund war in the east of the country rather than rebuild it.

The group blocked the websites of Chancellor Angela Merkel and the German parliament, the Bundestag, according to CyberBerkut’s website. The German publication Der Spiegel says the German government is aware of the problem, with government spokesman, Steffan Seibert calling it “a severe attack.”

"Our service provider's data center is under a severe attack that has apparently been caused by a variety of external systems," he added. The websites have been down and inaccessible since 09.00 GMT.

It is thought to be the first successful prolonged attack on the government's websites, which intelligence agency officials say face about 3,000 such hacker assaults daily. The head of the BfV domestic intelligence agency said recently about five of the daily attacks came from foreign intelligence agencies, Reuters reports.

The websites, which include general information, speeches and podcasts from the chancellor and general government information, are used by journalists and the public.

It is believed they targeted German governmental websites as Yatsenyuk is set to meet German Chancellor Angela Merkel on January 8 in Berlin. They are expected to discuss relations with Russia as well as internal developments within Ukraine.

#CyberBerkut has blocked the websites of the German Chancellor and the Bundestag

CyberBerkut say that Prime Minister Yatsenyuk intends to use billions of dollars of aid from the European Union and International Monetary Fund to continue to wage war in the east of the country, which has already killed thousands of people. The Ukrainian government intends to review its national budget by February 15.

“That's why we appeal to all people and the government of Germany to stop financial and political support of the criminal regime in Kiev, which unleashed a bloody civil war,” the organization said on its website. “This war has already taken thousands of lives, and Yatsenyuk will kill more for your money!” they added.

READ MORE: ‘Premier of war’: Czech president says Yatsenyuk not seeking peaceful solution for E. Ukraine

The hacktivist group believes that money received from the EU and IMF should be spent on trying to repair the country’s infrastructure. CyberBerkut is named after the riot police unit that became an “arch-enemy” of Maidan – has pledged to fight against the stream of “neo-fascist propaganda” from a “vicious and corrupt media.”

Pro-Russian Cyber Berkut #hacker group sent TOL a message claiming to take down sites of German Chancellor and the Bundestag.They seem down. — Transitions Online (@TransitionsMag) January 7, 2015

In November 2014, CyberBerkut uncovered documents showing Kiev's detailed demands for money from the US military, and Washington agreeing to give them support.

According to the hacktivists, who made the documents public on Tuesday, the Ukrainian military has recently been asking for and been promised financial support from the United States, worth hundreds of thousands of dollars.

READ MORE: Kiev’s army should gear up for winter warfare – Ukraine Defense Ministry

The hackers claimed they obtained the confidential State Department documents by breaking into a mobile device belonging to one of the American delegation's members, who had traveled to Ukraine together with US Vice President Joe Biden. The US politician visited Kiev on November 20-21.

In March 2014, the group claimed responsibility for taking down three NATO websites in a series of DDoS attacks. The group criticized NATO for stirring up turmoil in Ukraine and helping the “Kiev junta” suppress freedom of speech.

READ MORE: Ukrainian CyberBerkut takes down NATO websites

CyberBerkut claims it brought down NATO’s main website (nato.int), as well as the sites of the alliance’s cyber defense center (ccdcoe.org) and NATO's Parliamentary Assembly (nato-pa.int).

The group, in a message posted on its website, says its members will “not allow the presence of NATO occupation on the territory of our homeland!”