Volodymyr Zelenskyy, Ukraine's prime minister, at a news conference on the sidelines of the Eastern Partnership Summit at the Europa building in Brussels, Belgium, on Wednesday, Dec. 15, 2021. Leading nations of the European Union are resisting a push to quickly draw up specific sanctions and other punishments to impose on Russia if it invades Ukraine, even as the Kremlin shows no sign of backing off a massive troop buildup near its neighbor. Photographer: Valeria Mongelli/Bloomberg