By Silke Koltrowitz and Arnd Wiegmann ZURICH (Reuters) – Hundreds of Ukrainians lined up for food handouts in central Zurich on Saturday as wealthy Switzerland struggles to cope with the arrival of around 40,000 refugees since Russia invaded Ukraine in late February. Refugees in official accommodation receive some financial support from the state, although this is often not enough to live on in a country where the cost of living is among the highest in the world. Those staying with private host families – around half the arrivals, according to the authorities – are falling through the cracks o…