Ukraine has reportedly utilized U.S.-made ATACMS missiles to strike a military facility inside Russian territory, marking a pivotal shift in the conflict’s dynamics. The operation follows the Biden administration's decision to authorize the use of long-range weaponry for targets deep within Russia, a move Kyiv argues is essential for neutralizing launch sites used for cross-border attacks. In response, President Vladimir Putin signed a revised nuclear doctrine, lowering the threshold for the use of nuclear weapons if Russia is attacked by a non-nuclear state supported by a nuclear power. While Western officials suggest the policy change aims to discourage further escalation and the involvement of foreign troops, Kremlin spokespeople characterized the development as a 'new phase' of Western involvement in the war. International leaders at the G20 summit in Brazil have urged restraint, emphasizing the need for a diplomatic resolution as the conflict surpasses its 1,000th day.