He will undoubtedly be remembered as one of the great leaders of the last quarter of the 20th century, who brought to a fairly peaceful end one of the most oppressive regimes in history, yet without being able to alter for the better the political culture that had nurtured it. Successfully ending the Cold War after just over four decades, Gorbachev proved more skilled at initiating good relations with the major western powers than at securing and maintaining the support of his own people. British Prime Minister Margaret Thatcher memorably called the Soviet leader "a man one could do business with." Nevertheless, co-operation at élite levels does not necessarily lead to lasting friendship between nations, as we are seeing at present with Russia's international isolation over its attack on Ukraine.
I will have more to say about Gorbachev's legacy in the near future.