A woman holds a newborn baby inside a bomb shelter in a maternity hospital during shelling in Donetsk, eastern Ukraine, where pro-Russian rebels were vowing to make a final stand. Agence France-Presse/Getty Images Intensifying gunfire and explosions rocked Donetsk again Sunday as Ukrainian forces fought to complete the encirclement of pro-Russia insurgents in their largest remaining stronghold. Amid warnings by the rebels of civilian suffering, Russia said it was in talks with Kiev and international agencies about delivering humanitarian relief to the rebel-held cities. Overnight, troops advanced to “tighten the ring” around Donetsk, destroying “a large quantity of armor” and killing many insurgents, the Ukrainian command said. The Donetsk city council said that during a “massive bombardment from heavy weapons,” shells hit an outpatient clinic, a private house and other civilian infrastructure, injuring one woman. The separatists said they are turning Donetsk into a military camp and described conditions […]