Protesters celebrated in Sri Lanka's commercial capital late into the night Thursday after President Gotabaya Rajapaksa tendered his resignation following a week of escalating demonstrations over the country's crippling economic crisis.

More than 50 US and Japanese warplanes flew over waters near Japan this week as the two allies put on a show of force amid rising tensions in the region with China and Russia.

• Sri Lanka's crisis rages on. Here's what we know