A woman wearing a t-shirt reading "Our president" with a picture of Russian President Vladimir Putin reacts outside the Russian embassy in Belgrade on March 23, 2024, a day after a gun attack in Krasnogorsk, outside Moscow. Camouflaged assailants opened fire at the packed Crocus City Hall in Moscow's northern suburb of Krasnogorsk on March 22, 2024, evening ahead of a concert by Soviet-era rock band Piknik in the deadliest attack in Russia for at least a decade. Russia on March 23, 2024, said it had arrested 11 people - including four gunmen - over the attack on a Moscow concert hall claimed by Islamic State, as the death toll rose to over 130 people. (Photo by OLIVER BUNIC / AFP)