Former Soviet leader Mikhail Gorbachev warned that tensions between Russia and European powers over the Ukraine crisis could result in a major conflict or even nuclear war, in an interview in a German news magazine on Saturday.
"A war of this kind would unavoidably lead to a nuclear war," the 1990 Nobel Peace Prize winner told Der Spiegel.
"We won't survive the coming years if someone loses their nerve in this overheated situation," added Gorbachev, 83. "This is not something I'm saying thoughtlessly. I am extremely concerned."
Tensions between Russia and Western powers rose after pro-Russian separatists took control of large parts of eastern Ukraine and Russia annexed Crimea in early 2014.
The United States, NATO and the European Union accuse Russia of sending troops and weapons to support the separatist uprising, and have imposed sanctions on Moscow.
Russia denies providing the rebels with military support and fends off Western criticism of its annexation of Crimea, saying the Crimean people voted for it in a referendum.
Gorbachev, who is widely admired in Germany for his role in opening the Berlin Wall and steps that led to Germany's reunification in 1990, warned against Western intervention in the Ukraine crisis.
"The new Germany wants to intervene everywhere," he said in the interview. "In Germany evidently there are a lot of people who want to help create a new division in Europe."
The remarks by the elder statesman, whose "perestroika" (restructuring) policy helped end the Cold War, dramatically expand warnings he issued late last year. In November, he said a new cold war could be on the way, with potentially dire consequences, if tensions were not reduced over the Ukraine crisis.
"The world is on the brink of a new Cold War. Some are even saying that it has already begun," he said in a November interview.
The diplomatic standoff over Ukraine is the worst between Moscow and the West since the Cold war ended more than two decades ago.
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