Polish and allied aircraft were activated early today to ensure the safety of airspace after Russia launched air strikes targeting western Ukraine near the border with Poland, the Operational Command of the Polish Armed Forces said.

Russia launched a massive attack on Ukraine's Kharkiv, killing four and injuring dozens. President Zelenskyy condemned the violence and appealed for urgent air defense assistance.

NBC News has analyzed satellite imagery to dig into the claims being made by Kyiv and Moscow as part of a wider propaganda war being waged in parallel to the actual fighting.