Key developments on Dec. 19: Zelensky: Military proposes to mobilize 450,000-500,000 new soldiersZelensky: Ukraine to produce 1 million drones next yearMoscow mayor claims air defense prevented drone attackRussian attacks against Kherson, Sumy oblasts injure 6White House: Russia, China, North Korea seek to strengthen tiesUkraine’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. Zelensky gathered journalists on Dec. 19 for a two-hour-long year-e…