Washington: The Cuban flag was raised over Havana’s embassy in Washington on Monday for the first time in 54 years as the United States and Cuba formally restored relations, opening a new chapter of engagement between the former Cold War foes.

Cuban Foreign Minister Bruno Rodriguez presided over the reinauguration of the embassy, a milestone in the diplomatic thaw that began with an announcement by US President Barack Obama and Cuban President Raul Castro on 17 December.

Underscoring differences that remain between the United States and Communist-ruled Cuba, Rodriguez seized the opportunity to urge Obama to use executive powers to do more to dismantle the economic embargo, the main stumbling block to full normalization of ties. For its part, the Obama administration pressed Havana for improvement on human rights.

But even with continuing friction, the reopening of embassies in each other’s capitals provided the most concrete symbols yet of what has been achieved after more than two years of negotiations between governments that had long shunned each other.

In a further sign of a desire to move past a half-century of enmity, Secretary of State John Kerry later hosted Rodriguez, the first Cuban foreign minister to visit Washington since the Cuban Revolution, for talks at the State Department.

While both men stressed the momentous occasion, they also sought to temper optimism fueled by the day’s festivities.

“The historic events we are living today will only make sense with the removal of the economic, commercial and financial blockade, which causes so much deprivation and damage to our people, the return of occupied territory in Guantanamo, and respect for the sovereignty of Cuba,” Rodriguez said at the reopening ceremony.

Obama has modestly eased some business and travel restrictions but the broader 53-year-old embargo remains in place. Only Congress can lift it, something majority Republicans are unlikely to do anytime soon despite the Democratic president’s appeal for it to be rescinded.

With Rodriguez at his side later on Monday, Kerry hailed a “new beginning” in relations but said there was still much that divided the two governments and that the path to complete normalization may be “long and complex.”

White House spokesman Josh Earnest told reporters the administration was “hopeful” that Cuba in coming years would start to show respect for basic human rights.