By Angie Teo and Stanley Widianto JAKARTA (Reuters) – Russian President Vladimir Putin plans to attend the next G20 summit in Indonesia later this year and received valuable backing from Beijing on Wednesday in a pushback to suggestions by some members that Russia could be barred from the group. The United States and its Western allies are assessing whether Russia should remain within the Group of Twenty major economies following its invasion of Ukraine, sources involved in the discussions told Reuters. But any move to exclude Russia would probably be vetoed by others in the group, raising the…