By Nina Chestney LONDON (Reuters) – Europe will need to secure large quantities of gas if it wants to avoid soaring prices and crippling energy bills next winter in the event of disruption to flows from Russia. Already high wholesale gas and power prices spiked this week when Germany halted certification for the Nord Stream 2 pipeline which bypasses Ukraine to transport gas from Russia to Europe, and on Moscow’s military move against Kyiv. Russia, which supplies around 40% of Europe’s gas, has said it will continue to deliver natural gas to world markets and analysts say sanctions against Russ…