By Yimou Lee, Fabian Hamacher and Ann Wang TAIPEI (Reuters) – Taiwan is preparing its air-raid shelters as rising tension with China and Russia’s invasion of Ukraine raise new fears about the possibility of a Chinese attack on the democratic island. China considers Taiwan its territory and has increased military activity in the air and seas around it. Taiwan vows to defend itself and has made strengthening its defences a priority, with regular military and civil defence drills. The preparations include designating shelters where people can take cover if Chinese missiles start flying in, not in…