The Ukrainian government has offered a number of key concessions to the separatist forces it’s battled since April. A proposal from President Petro Poroshenko would grant the separatists amnesty, language protections, and self-governance rights under Ukrainian sovereignty. The offer comes as part of the peace effort following the truce brokered earlier this month. In the worst violence since the truce was reached, at least six people were killed and 15 wounded in shelling Monday in the rebel stronghold of Donetsk. The violence comes as the United States and other NATO countries began military exercises in Ukraine.