Which country recently test-fired a nuclear-capable ballistic missile, named ‘K-4’, which can be launched from submarine?

The United States sent multiple military ships and aircraft closer to Israel as a show of support, Defense Secretary Lloyd Austin said, with Washington believing Hamas’ deadly attacks may have been motivate to disrupt a potential normalizing of Israel-Saudi Arabia ties. Hamas fighters rampaged through Israeli towns as the country suffered its bloodiest day in decades on Saturday. Israel battered Palestinians with air strikes in Gaza on Sunday, with hundreds reportedly killed on both sides. The spiraling violence threatens to start a major new war in the Middle East.