- Beijing summons U.S. ambassador to China
- Chinese ambassador tells CNN the U.S. operation is "hypocritical"
- U.S. defense secretary says such missions will continue
- Chinese Defense Ministry: Two Chinese warships, aircraft monitored U.S. Navy vessel
(CNN)Chinese ships and aircraft warned and tracked a U.S. Navy warship Tuesday as it came close to reefs claimed by China in contested waters in the South China Sea.