"longstanding relations" is a correct and usable phrase in written English.
You can use it to refer to relationships that have existed for a long period of time. For example, "The two countries have had longstanding relations for many years."
But they have longstanding relations with the Supreme Council and Iran.
Mr Cragnotti had longstanding relations with Cesare Geronzi, Capitalia's chairman, who hand-picked Mr Arpe to run his banks.
Algeria is a key player as it is in the position of putting the most pressure on armed groups based there and its intelligence services have longstanding relations with Ansar Dine's leader, Iyad Ag Ghali.
Saudi Arabia possesses an array of assets that can be critical in the war against terrorism, including great influence in the Islamic world, longstanding relations with Afghanistan's Taliban leadership and modern air bases.
The French move carries the personal mark of Mr. Kouchner, who was one of the few French politicians to back the forcible removal of Saddam Hussein before the American-led invasion in 2003, and whose longstanding relations with Kurdish and Shiite leaders have earned him credibility in the region.
Today's brands with a good size of Gen Z customers must definitely think of building strong and longstanding relations through mobile loyalty apps," says Vas Diachenko, CEO of LoyaltyPlant.
But a dozen members of the United States Congress, complaining of his "longstanding relation with and admiration for the Communist dictator and sponsor of terrorism Fidel Castro," sent a letter to President Bush saying Mr. da Silva's remarks "raise grave questions concerning the international policies a government of Brazil might pursue under his presidency".
6 There is a longstanding relation between poverty and mortality.
Thus as a general rule, GPs have a continuous and longstanding relation with their patients.
Our findings support the notion that magnesium intake improves systemic inflammation and endothelial dysfunction and may play a role in the prevention of type 2 diabetes and metabolic syndrome, a longstanding relation with causality yet to be confirmed.
The president of the Philippines, Rodrigo Duterte, who is nurturing warm ties with China and has warned he may break longstanding military relations with the United States, took a conciliatory approach over the Chinese action.
