President Vladimir Putin said on Wednesday that Ukraine was upping its attacks on Russian territory in order to interfere with upcoming presidential elections. Russia has this week faced some of the most significant attacks on its territory since Moscow sent troops into Ukraine more than two years ago. Several oil refineries have been hit in waves of drone attacks and on Tuesday groups of pro-Kyiv volunteer fighters made up of Russians who oppose the Kremlin said they had broken into the border regions of Kursk and Belgorod in a brazen attack that was eventually suppressed. Asked about the att…