The 59-year-old, who served as head of state between 2008 and 2012, sought "friendly" ties with Europe and the United States during his single term but faded into obscurity after handing the post back to President Vladimir Putin.
Demoted to prime minister in 2012 and then made deputy head of Russia's security council in 2020 -- a largely advisory role -- Medvedev began espousing hardline views on social media shortly after Moscow launched its Ukraine offensive.
In public statements since the conflict began he has described Westerners as "bastards and degenerates", declared that "Ukraine is, of course, Russia" and raised the possibility of using nuclear weapons against Russia's enemies.
In June, after the US launched air strikes on nuclear facilities in Moscow-allied Iran, Medvedev suggested that "a number of countries" were willing to provide Tehran with nuclear warheads, prompting an angry Trump to accuse him of "casually" threatening a nuclear strike.
On Thursday, Medvedev alluded to Moscow's semi-automatic "Dead Hand" nuclear arms control system in a Telegram post criticising Trump.
Medvedev's critics have derided his posts as an attempt to retain political relevance in Russia's crowded elite circles, but Trump has taken the threats seriously.
"Based on the highly provocative statements," Trump said Friday, "I have ordered two nuclear submarines to be positioned in the appropriate regions, just in case these foolish and inflammatory statements are more than just that."
- Tandem rule -
Medvedev's often incendiary posts contrast sharply with his public image in office, when he declared Russia did not want confrontation with "any country" as part of his foreign policy doctrine.
In 2010, he signed a nuclear arms reduction treaty with US President Barack Obama, while in 2011 he brought Russia into the World Trade Organisation after 18 years of negotiations.
On his watch, Moscow also abstained in a key UN Security Council vote on Libya in 2011 that paved the way for a NATO-led military intervention, a decision Putin has relentlessly criticised since.
But it was always clear who was the senior partner in a pairing dubbed Batman and Robin by a secret US cable.
Medvedev's first act after winning a 2008 presidential election on the back of Putin's support was to appoint the Russian strongman as prime minister, giving Putin broad decision-making power.
While some in the West greeted Medvedev's arrival, others saw him as simply a placeholder for Putin, who was able to circumvent constitutional term limits and remain in de facto power.
In 2008 Russia sent troops into Georgia, fracturing relations with the West, a decision that Medvedev insisted he made but that a top general claimed was planned by Putin before Medvedev was even inaugurated.
His trademark modernisation programme was marked by bold statements but was also mercilessly mocked by commentators for being short on actions as Putin held real power.
- Putin's protege -
Medvedev, born in Putin's home town of Leningrad, owes his entire political career to the former KGB agent.
Putin took his protege to Moscow after being appointed prime minister in 1999 and Medvedev rapidly rose to become chairman of gas giant Gazprom. He also served as chief of staff at the Kremlin and as first deputy prime minister.
After taking office, he said Russia's economy had reached a "dead end" and required urgent reform.
But cynics pointed out that such words counted for little when Russia was still dominated by Putin, and Medvedev himself played down the idea there was any radical difference in their visions.
After championing anti-corruption measures while in office, Medvedev was himself accused of graft in 2017, when late opposition leader Alexei Navalny alleged he had built a luxury property empire using embezzled funds.
Navalny was labelled an "extremist" by Russian authorities in 2021.
While liberals and the West hoped Medvedev would reverse the increase in state control and erosion of civil liberties during Putin's previous rule, he showed little desire for a radical break with Putin's legacy.
"Vladimir Vladimirovich Putin really is modern Russia's most popular, experienced and successful politician," Medvedev said during an attempt to explain why he was standing down in favour of Putin in 2012.
Trump deploys nuclear submarines in row with Russia
Washington (AFP) Aug 1, 2025 -
US President Donald Trump ordered the deployment of two nuclear submarines Friday in an extraordinary escalation of what had been an online war of words with a Russian official over Ukraine and tariffs.
Trump and Dmitry Medvedev, the deputy chairman of Russia's security council, have been sparring on social media for days.
Trump's post on his Truth Social platform abruptly took that spat into the very real -- and rarely publicized -- sphere of nuclear forces.
"Based on the highly provocative statements," Trump said he had "ordered two Nuclear Submarines to be positioned in the appropriate regions, just in case these foolish and inflammatory statements are more than just that."
"Words are very important, and can often lead to unintended consequences, I hope this will not be one of those instances," the 79-year-old Republican posted.
The nuclear sabre rattling came against the backdrop of a deadline set by Trump for the end of next week for Russia to take steps to ending the Ukraine war or face unspecified new sanctions.
Despite the pressure from Washington, Russia's onslaught against its pro-Western neighbor continues to unfold at full-bore.
An AFP analysis Friday showed that Russian forces had fired a record number of drones at Ukraine in July.
Russian attacks have killed hundreds of Ukrainian civilians since June. A combined missile and drone attack on the Ukrainian capital Kyiv early Thursday killed 31 people, including five children, said rescuers.
Russian President Vladimir Putin, who has consistently rejected calls for a ceasefire, said Friday that he wants peace but that his demands for ending his nearly three-and-a-half year invasion were "unchanged".
Those demands include that Ukraine abandon territory and end ambitions to join NATO.
- Insults, nuclear rhetoric -
Trump did not say in his post whether he meant nuclear-powered or nuclear-armed submarines. He also did not elaborate on the deployment locations, which are kept secret by the US military.
The United States and Russia control the vast majority of the world's nuclear weaponry, and Washington keeps nuclear-armed submarines on permanent patrol as part of its so-called nuclear triad of land, sea and air-launched weapons.
Trump also did not refer specifically to what Medvedev had said to prompt his order.
Medvedev had criticised Trump on his Telegram account Thursday and alluded to the "fabled 'Dead Hand'" -- a reference to a highly secret automated system put in place during the Cold War to control the country's nuclear weapons.
This came after Trump had lashed out at what he called the "dead economies" of Russia and India.
Medvedev had also harshly criticized Trump's threat of new sanctions against Russia over Moscow's continuing invasion of Ukraine.
Accusing Trump of "playing the ultimatum game," he posted Monday on X that Trump "should remember" that Russia is a formidable force.
Trump responded by calling Medvedev "the failed former President of Russia, who thinks he's still President."
Medvedev should "watch his words," Trump posted at midnight in Washington on Wednesday. "He's entering very dangerous territory!"
Medvedev is currently deputy chairman of Russia's Security Council and a vocal proponent of Putin's war in Ukraine -- and generally antagonistic to relations with the West.
He served as president between 2008-2012, effectively acting as a placeholder for Putin, who was able to circumvent constitutional term limits and remain in de facto power.
The one-time reformer has rebranded over the years as an avid online troller, touting often extreme versions of official Kremlin nationalist messaging. His influence within the Russian political system remains limited.
- Flowers for the children -
In Kyiv, residents held a day of mourning for the 31 killed on Thursday, most of whom were in a nine-storey apartment block torn open by a missile.
Rescue workers pulled bodies from the debris Friday.
Iryna Drozd, a 28-year-old mother of three, was laying flowers at the site to commemorate the five children killed.
The youngest, whose body was found early Friday, was two years old.
"These are flowers because children died. We brought flowers because we have children. Our children live across the street from here," she told AFP.
Ukrainian President Volodymyr Zelensky said only Putin could end the war and renewed his call for a meeting between the two leaders.
"The United States has proposed this. Ukraine has supported it. What is needed is Russia's readiness," he wrote on X.
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