By Martin Quin Pollard and Yew Lun Tian BEIJING (Reuters) -Russia’s attack on Ukraine, which China refuses to condemn or even call an invasion, has sent Beijing into a diplomatic scramble to limit blowback while standing by a partner with which it has grown increasingly close in opposition to the West. China has repeatedly called for dialogue, with Foreign Minister Wang Yi telling senior European officials in a flurry of telephone calls on Friday that China respects countries’ sovereignty, including Ukraine’s, but that Russia’s concerns about NATO’s eastward expansion should be properly addres…