Answer : 1. "Russia"
Explanation :

Russia's Defense Ministry confirmed the recent successful test of the RS-24 Yars intercontinental ballistic nuclear missile. Developed by Russia, Yars is a thermonuclear armed ICBM with a reported range of 12,000 km and the ability to hit targets more than 11,000 km away. It can carry multiple independently targetable warheads and is designed to deploy multiple re-entry vehicles (MIRVs) for independent targeting, enhancing its strategic capabilities.