By Pavel Polityuk KYIV (Reuters) -Ukraine pledged funds on Sunday to try to keep its airspace open to commercial flights, as some carriers reviewed their services to the country after the United States warned that Russia could invade at any time. Dutch airline KLM – part of Air France – said https://www.reuters.com/world/biden-putin-speak-ukraine-warnings-mount-2022-02-12 it would stop services to Ukraine and Germany’s Lufthansa said it was considering suspending flights. Two third of the 298 passengers killed when Malaysia Airlines MH17 was shot down over eastern Ukraine in 2014 as it flew fr…