Russian artillery bombarded residential districts of Ukraine’s second largest city Kharkiv on Monday, killing possibly dozens of people, Ukrainian officials said, as Moscow’s invading forces met stiff resistance from Ukrainians on a fifth day of conflict.

The attacks took place while Russian and Ukrainian officials met on the Belarusian border to discuss a ceasefire. The talks ended with no breakthrough.

Russia also faced deepening isolation and economic turmoil as Western nations, united in condemnation of its assault, hit it with an array of sanctions that created ripple effects around the world. Global shares slid and oil prices jumped.