Ukrainian President Petro Poroshenko accused Russian President Vladimir Putin of trying to annex his entire country in interviews with German newspapers on Thursday.

"Don't believe Putin's lies," Poroshenko told Bild, the best-selling paper in Germany, according to Reuters.

Russia has said that it was provoked into firing on Ukrainian ships. It later seized three vessels and their crews on Sunday.

Poroshenko compared Russia's statements to their justifications for annexing the Crimean peninsula in 2014.

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“Putin wants the old Russian empire back,” he said. “Crimea, Donbass, the whole country. As Russian Tsar, as he sees himself, his empire can’t function without Ukraine. He sees us as his colony.”

During an interview with the Funke newspaper group, Poroshenko called on Germany, the largest buyer of Russia's natural gas exports, to stop building the Nord Stream 2. With the massive undersea gas pipeline, Russia could supply Germany directly with fuel.

"We need a strong, resolute and clear reaction to Russia’s aggressive behavior,” he told the newspaper group, Reuters reports. “That also means stopping the Nord Stream 2 gas pipeline project.”

German officials said Wednesday that their position that the pipeline, which is being built by Russian state-owned energy company Gazprom, was a private investment.

They added that talk of tighter sanctions against Russia, as the U.S. and other European politicians have demanded, are "premature," according to Reuters.

Poroshenko has also called for the stationing of NATO vessels in the Sea of Azov.

Russia is reportedly planning to move anti-aircraft missiles to Crimea as tensions escalate.

On Tuesday, President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE suggested he may call off his meeting with Putin at this week's Group of 20 (G-20) summit over Russia's aggression against the Ukrainian navy.

Secretary of State Mike Pompeo Michael (Mike) Richard PompeoPutin nominated for Nobel Peace Prize The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Pompeo accused of stumping for Trump ahead of election MORE on Monday slammed Russia for the move, calling it a "dangerous escalation."

"The United States condemns this aggressive Russian action," Pompeo said. "We call on Russia to return to Ukraine its vessels and detained crew members, and to respect Ukraine’s sovereignty and territorial integrity within its internationally recognized borders, extending to its territorial waters.”