The Indian army says 20 of its troops were killed in a violent clash with Chinese forces in a disputed border region high in the Himalayas. China also reported casualties, but it has not confirmed any fatalities.
Why it matters: This is the most perilous moment for relations between the two Asian giants in decades. The sides had repeatedly clashed along the Line of Actual Control (LAC) but hadn't exchanged gunfire in 45 years. It's unclear whether guns were used in the altercation overnight.