Russia on Tuesday test-fired a new intercontinental ballistic missile as part of efforts to modernise the country’s nuclear forces, a launch hailed by President Vladimir Putin just days after his claim that the fighting in Ukraine is nearing an end. Putin said that the nuclear-armed Sarmat missile would enter combat service at the end of the year. It was built to replace the ageing Soviet-built Voyevoda. “This is the most powerful missile in the world,” Putin declared, adding that the combined...