The president of Ukraine has declared martial law as Russia launches a military operation in the country. During a public address Thursday. Volodymyr Zelenskyy confirmed Russia carried out drone strikes against their military infrastructure, border guards and border units.

Zelenskyy went on to say explosions were heard in many cities. He urged residents to stay home and remain calm. His remarks came after Russian President Vladimir Putin declared a special military operation in the sovereign country. Zelenskyy said Ukraine’s entire security sector is working and is “ready for anything.”