Ukrainian President Petro Poroshenko said in an interview to Berlin-based newspaper Bild on Wednesday that the risk of open war between Russia and Ukraine is bigger than it was a year ago and Russian President Vladimir Putin has begun an "information war" against Germany.
"The danger of an open war is greater than last year," Poroshenko said, adding, "Russia is investing a great deal in war preparations."
Russia has not implemented "a single point" of the Minsk agreement, Poroshenko said after meeting with German Chancellor Angela Merkel in Berlin on Monday.
The Minsk agreement was signed by the leaders of Ukraine, Russia, France, and Germany on February 11, 2015 with the intention of taking steps to end the ongoing war in the east of Ukraine.
The president also said that Russia is boosting its military presence on the border with Ukraine.
German government spokesman Steffen Seibert said that chancellor Merkel spoke with Putin by phone to use his influence to ensure that a ceasefire is upheld in Ukraine and that monitors from the OSCE European security organisation are granted free access to conflict areas.
German officials say that Moscow aims to become more powerful and disrupt Europe.
"Now Putin has opened an information war against Germany as well," Poroshenko said.
Moscow has so far not issues a denial of the accusation that it is pursuing a policy of misinformation in Germany.
In March 2014 Russian soldiers seized the Crimean Peninsula in Ukraine following the ousting of pro-Russian leader Viktor Yanukovych after mass protests in Kiev.