Which countries joined the war after Germany declared war on russia?

After Germany declared war on Russia on August 1, 1914, several countries became involved in the conflict. France, allied with Russia, was drawn into the war shortly after, declaring war on Germany on August 3. The United Kingdom entered the war on August 4 when Germany invaded Belgium, violating its neutrality. Additionally, Austria-Hungary, already at war with Serbia, continued its military actions in the broader context of the conflict.