Ukraine’s Foreign Minister Dmytro Kuleba on Thursday lashed out at those criticizing the slow pace of Ukraine’s counteroffensive, calling on them to keep their mouths shut.

“Criticizing the slow pace of counteroffensive equals to spitting into the face of Ukrainian soldier who sacrifices his life every day, moving forward and liberating one kilometer of Ukrainian soil after another,” he told reporters during a break at an informal meeting of EU foreign ministers that he attended in Toledo, Spain.

“I would recommend all critics to shut up. Come to Ukraine and try to liberate one square centimeter by themselves,” he added.