Key developments on Dec. 19: Zelensky: Military proposes to mobilize 450,000-500,000 new soldiers Zelensky: Ukraine to produce 1 million drones next year Moscow mayor claims air defense prevented drone attack Russian attacks against Kherson, Sumy oblasts injure 6 White House: Russia, China, North Korea seek to strengthen ties Ukraine's military leadership proposed to mobilize 450,000-500,000 additional conscripts, President Volodymyr Zelensky said, adding that the plan has yet to address several key issues before he can support it.