By Ben Blanchard TAIPEI (Reuters) -Taiwan’s defence ministry accused China on Saturday of threatening aviation safety and waging psychological warfare on the island’s people with a recent spate of balloons spotted near or over the island, days before key Taiwanese elections. The potential for China to use balloons for spying became a global issue in February when the United States shot down what it said was a Chinese surveillance balloon. China said the balloon was a civilian craft that accidentally drifted astray. Taiwan is on high alert for Chinese military and political activity ahead of th…