An activist holds a single-person protest in support of Russian President Vladimir Putin in central Moscow on September 22, 2022. A poster rephrases a Soviet WWII slogan - "Everything for the Front! Everything for the Victory!". - President Putin called up Russian military reservists on September 21, saying his promise to use all military means in Ukraine was "no bluff," and hinting that Moscow was prepared to use nuclear weapons. His mobilisation call comes as Moscow-held regions of Ukraine prepare to hold annexation referendums this week, dramatically upping the stakes in the seven-month conflict by allowing Moscow to accuse Ukraine of attacking Russian territory. (Photo by Alexander NEMENOV / AFP)