As virus cases surge, nations set aside differences to help

Russia sent medical equipment and masks to the United States. Cuba sent doctors to France. Turkey dispatched masks, hazmat suits, goggles, and disinfectants to Italy and Spain. Rich nations staggering to meet health care demands are welcoming help from less wealthy ones.

European nations facing extraordinary demand for hospital intensive-care beds are putting up makeshift hospitals, unsure whether they will find enough healthy medical staff to run them. London is just days from unveiling a 4,000-bed temporary hospital built in a huge convention center to take non-critical patients so...