A French doctor warned Monday that his country has “lost control of the epidemic,” a day after health authorities reported more than 52,000 new coronavirus cases as nations across Europe enact more sweeping restrictions to try to slow surging infection rates. Spain — the first European country to surpass 1 million confirmed COVID-19 cases — declared a state of emergency Sunday that included a nationwide overnight curfew, a cap of six people on social gatherings and possible travel bans in and out of the hardest-hit regions. In two major Italian cities, people took to the streets amid a pushback from small sections of society to new restrictions.