Gorbachev, the last Soviet president, forged arms reduction deals with the United States and partnerships with Western powers to remove the Iron Curtain that had divided Europe since World War II and bring about the reunification of Germany.

But his broad internal reforms helped weaken the Soviet Union to the point where it fell apart, a moment that President Vladimir Putin has called the “greatest geopolitical catastrophe” of the 20th century.

“Mikhail Gorbachev passed away tonight after a serious and protracted disease,” Russia’s Central Clinical Hospital said on Tuesday.

Putin expressed “his deepest condolences”, Kremlin spokesman Dmitry Peskov told Interfax news agency.

Putin said in 2018 he would reverse the collapse of the Soviet Union if he could, news agencies reported at the time.

World leaders were quick to pay tribute. European Commission chief Ursula von der Leyen said Gorbachev had opened the way for a free Europe.

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British Prime Minister Boris Johnson, citing Putin’s invasion of Ukraine, said Gorbachev’s “tireless commitment to opening up Soviet society remains an example to us all”.

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After decades of Cold War tension and confrontation, Gorbachev brought the Soviet Union closer to the West than at any point since World War Two.

But he saw that legacy wrecked in the final months of his life, as the invasion of Ukraine brought Western sanctions crashing down on Moscow, and politicians in both Russia and the West began to speak of a new Cold War.

“Gorbachev died in a symbolic way when his life’s work, freedom, was effectively destroyed by Putin,” said Andrei Kolesnikov, senior fellow at the Carnegie Endowment for International Peace.

Gorbachev won the Nobel Peace Prize in 1990.

He will be buried in Moscow’s Novodevichy Cemetery next to his wife Raisa, who died in 1999, said Tass, citing the foundation that the ex-Soviet leader set up once he left office.

When pro-democracy protests swept across the Soviet bloc nations of communist Eastern Europe in 1989, he refrained from using force – unlike previous Kremlin leaders who had sent tanks to crush uprisings in Hungary in 1956 and Czechoslovakia in 1968.

But the protests fuelled aspirations for autonomy in the 15 republics of the Soviet Union, which disintegrated over the next two years in chaotic fashion.

Gorbachev – who was briefly deposed in an August 1991 coup by party hardliners – struggled vainly to prevent that collapse.

“The era of Gorbachev is the era of perestroika, the era of hope, the era of our entry into a missile-free world … but there was one miscalculation: we did not know our country well,” said Vladimir Shevchenko, who headed Gorbachev’s protocol office when he was Soviet leader.

“Our union fell apart, that was a tragedy and his tragedy,” RIA news agency cited him as saying.

On becoming general secretary of the Soviet Communist Party in 1985, aged just 54, he had set out to revitalise the system by introducing limited political and economic freedoms, but his reforms spun out of control.

“He was a good man – he was a decent man. I think his tragedy is in a sense that he was too decent for the country he was leading,” said Gorbachev biographer William Taubman, a professor emeritus at Amherst College in Massachusetts.

Gorbachev’s policy of “glasnost” – free speech – allowed previously unthinkable criticism of the party and the state, but also emboldened nationalists who began to press for independence in the Baltic republics of Latvia, Lithuania, Estonia and elsewhere.

Many Russians never forgave Gorbachev for the turbulence that his reforms unleashed, considering the subsequent plunge in their living standards too high a price to pay for democracy.

“He gave us all freedom – but we don’t know what to do with it,” liberal economist Ruslan Grinberg told the armed forces news outlet Zvezda after visiting Gorbachev in hospital in June.