In a major update to its nuclear strategy, Russia has officially declared that it will protect its close ally Belarus under its nuclear umbrella. This means that if Belarus faces an attack, Russia could use nuclear weapons to defend it. This decision is part of an agreement with the Collective Security Treaty Organization (CSTO), a group of six countries led by Russia, which also includes Armenia, Kazakhstan, Kyrgyzstan, Tajikistan, and Belarus. The announcement comes after a special meeting of...