In Moscow, President Vladimir Putin pledged Thursday to strengthen Russia’s nuclear forces with the deployment of a new generation of intercontinental ballistic missiles. Putin also promised to speed mass production of air- and sea-based hypersonic missiles and other conventional weapons. Putin’s remarks came two days after he said Russia was suspending much of its participation in New START, the last remaining nuclear arms reduction treaty between the U.S. and Russia. President Biden called the move a “big mistake.” Neither Russia nor the U.S. have signed or ratified the U.N.’s Treaty on the Prohibition of Nuclear Weapons.