(Reuters) -Finland is preparing to close its airspace to Russian air traffic, Minister of Transport and Communications Timo Harakka said in a tweet late on Saturday, making it the latest European country to take this measure after Russia’s invasion of Ukraine. The moves follow similar closures of airspace of the UK, Poland, Bulgaria, Czech Republic and Romania to Russia’s aircraft. Lithuania and Latvia, have also said they were closing their airspace to Russian airliners, while Germany said it was preparing to do so. Russia’s likely countermeasure will heavily hurt Finland’s state carrier Finn…