VILNIUS—Europe urged pharmaceutical companies on Tuesday to stand by their word in supplying coronavirus vaccines amid a series of delivery cuts and delays, as hopes for a quick fix to COVID-19 slowly crumble into recrimination. The world has hailed the super-fast development of vaccines as the best chance of escaping the year-long pandemic, which has killed more than 2.1 million people, anxious to reboot economies and restart travel by the European summer. But vaccine rollouts in the EU have been slow compared with some other countries, and fraught with problems, not least interruptions to supply chains. AstraZeneca, which developed its shot with Oxford University, told the EU that it could not meet agreed supply targets by the end of March. Pfizer said there would be a temporary impact on shipments in late January to early February. “Europe invested billions to help develop the world’s first COVID-19 vaccines. To create a …