NEW DELHI, INDIA — India and China have resolved a three-week standoff over an ice-covered plateau along their disputed Himalayan border. The confrontation, the latest strain on the sometimes uneasy ties between the Asian giants, had threatened to cast a shadow over the upcoming visit by India’s foreign minister to Beijing. The tense, 20-day crisis in the northern Ladakh region began when about 50 Chinese soldiers pitched tents deep inside what New Delhi claims is its territory, and ended with both sides returning to their original…