HAVANA >> Raul Castro turned over Cuba’s presidency today to a 57-year-old successor he said would hold power until 2031, a plan that would place the state the Castro brothers founded and ruled for 60 years in the hands of a Communist Party official little known to most on the island.

Castro’s 90-minute valedictory speech offered his first clear vision for the nation’s future power structure under new President Miguel Mario Diaz-Canel Bermudez. Castro said he foresees the white-haired electronics engineer serving two five-year terms as leader of the Cuban government, and taking the helm of the Communist Party, the country’s ultimate authority, when Castro leaves the powerful position in 2021.

“From that point on, I will be just another soldier defending this revolution,” Castro said. The 86-year-old general broke frequently from his prepared remarks to joke and banter with officials on the dais in the National Assembly, saying he looked forward to having more time to travel the country.

In his own half-hour speech to the nation, Diaz-Canel pledged to preserve Cuba’s communist system while gradually reforming the economy and making the government more responsive to the people.

“There’s no space here for a transition that ignores or destroys the legacy of so many years of struggle,” Diaz-Canel said. “For us, it’s totally clear that only the Communist Party of Cuba, the guiding force of society and the state, guarantees the unity of the nation of Cuba.”

Diaz-Canel said he would work to implement a long-term plan laid out by the National Assembly and communist party that would continue allowing the limited growth of private enterprises like restaurants and taxis, while leaving the economy’s most important sectors such as energy, mining, telecommunications, medical services and rum- and cigar-production in the hands of the state.

“The people have given this assembly the mandate to provide continuity to the Cuban Revolution during a crucial, historic moment that will be defined by all that we achieve in the advance of the modernization of our social and economic model,” Diaz-Canel said.

Cubans said they expected their new president to deliver improvements to the island’s economy, which remains stagnant and dominated by inefficient, unproductive state-run enterprises that are unable to provide salaries high enough to cover basic needs. The average monthly pay for state workers is roughly $30 a month, forcing many to steal from their workplaces and depend on remittances from relatives abroad.

“I hope that Diaz-Canel brings prosperity,” said Richard Perez, a souvenir salesman in Old Havana. “I want to see changes, above all economic changes allowing people to have their own businesses, without the state in charge of so many things.”

But in Miami, Cuban-Americans said they didn’t expect much from Diaz-Canel.

“It’s a cosmetic change,” said Wilfredo Allen, a 66-year-old lawyer who left Cuba two years after the Castros’ 1959 revolution. “The reality is that Raul Castro is still controlling the Communist Party. We are very far from having a democratic Cuba.”

After formally taking over from his older brother Fidel in 2008, Raul Castro launched a series of reforms that led to a rapid expansion of Cuba’s private sector and burgeoning use of cellphones and the internet. Cuba today has a vibrant real estate market and one of the world’s fastest-growing airports. Tourism numbers have more than doubled since Castro and President Barack Obama re-established diplomatic relations in 2015, making Cuba a destination for nearly 5 million visitors a year, despite a plunge in relations under the Trump administration.

Castro’s moves to open the economy even further have largely been frozen or reversed as soon as they began to generate conspicuous displays of wealth by the new entrepreneurial class in a country officially dedicated to equality among its citizens. Foreign investment remains anemic and the island’s infrastructure is falling deeper into disrepair. The election of President Donald Trump dashed dreams of detente with the U.S., and after two decades of getting Venezuelan subsidies totaling more than $6 billion a year, Cuba’s patron has collapsed economically, with no replacement in the wings.

Castro’s inability or unwillingness to fix Cuba’s structural problems with deep and wide-ranging reforms has many wondering how a successor without Castro’s founding-father credentials will manage the country over the next five or 10 years.

“I want the country to advance,” said Susel Calzado, a 61-year-old economics professor. “We already have a plan laid out.”

Most Cubans have known their new president as an uncharismatic figure who until recently maintained a public profile so low it was virtually nonexistent. Castro’s declaration today that he saw Diaz-Canel in power for more than a decade was likely to resolve much of the uncertainty about the power the new president would wield inside the Cuban system.

“The same thing we’re doing with him, he’ll have to do with his successor,” Castro said. “When his 10 years of service as president of the Council of State and Council of Ministers are over, he’ll have three years as first secretary in order to facilitate the transition. This will help us avoid mistakes by his successor, until (Diaz-Canel) retires to take care of the grandchildren he will have then, if he doesn’t have them already, or his great-grandchildren.”

Cuban state media said Russian President Vladimir Putin congratulated Diaz-Canel and thanked Castro for the many years of cooperation between the two countries, while Chinese President Xi Jinping also reaffirmed his country’s friendship with Cuba and expressed interest in deeper ties.

At the U.S. State Department, spokeswoman Heather Nauert expressed disappointment at the handover, saying Cuban citizens “had no real power to affect the outcome” of what she called the “undemocratic transition” that brought Diaz-Canal to the presidency.

Vice President Mike Pence tweeted at Castro that the U.S. won’t rest until Cuba “has free & fair elections, political prisoners are released & the people of Cuba are finally free!”

Diaz-Canel said his government would be willing to talk with the United States but rejected all demands for changes in the Cuban system.

With Castro watching from the audience, Diaz-Canel made clear that for the moment he would defer to the man who founded the Cuban communist system along with his brother Fidel. He said he would retain Castro’s cabinet through at least July, when the National Assembly meets again.

“I confirm to this assembly that Raul Castro, as first secretary of the Communist Party, will lead the decisions about the future of the country,” Diaz-Canel said. “Cuba needs him, providing ideas and proposals for the revolutionary cause, orienting and alerting us about any error or deficiency, teaching us, and always ready to confront imperialism.”

Diaz-Canel first gained prominence in central Villa Clara province as the top Communist Party official, a post equivalent to governor. People there describe him as a hard-working, modest-living technocrat dedicated to improving public services. He became higher education minister in 2009 before moving into the vice presidency.

In a video of a Communist Party meeting that inexplicably leaked to the public last year, Diaz-Canel expressed a series of orthodox positions that included somberly pledging to shutter some independent media and labeling some European embassies as outposts of foreign subversion.

But he has also defended academics and bloggers who became targets of hard-liners, leading some to describe him a potential advocate for greater openness in a system intolerant of virtually any criticism or dissent. International observers and Cubans alike will be scrutinizing every move he makes in coming days and weeks.

As in Cuba’s legislative elections, all of the leaders selected Wednesday were picked by a government-appointed commission. Ballots offered only the option of approval or disapproval and candidates generally receive more than 95 percent of the votes in their favor. Diaz-Canel was approved by 604 votes in the 605-member assembly. It was unclear if he had abstained or someone else had declined to endorse him.

The assembly also approved another six vice presidents of the Council of State, Cuba’s highest government body. Only one, 85-year-old Ramiro Valdes, was among the revolutionaries who fought with the Castros in the late 1950s in the eastern Sierra Maestra mountains.