The US remained "watchful" over developments along India's frontier with China as it cannot take its eyes off the regional security issues, a senior American official said on Wednesday in the backdrop of the over 29-month border standoff in eastern Ladakh that has significantly frayed ties between the two neighbours. Rear Admiral Michael L Baker, the Defence Attache at the US Embassy, also said that it is important to be "mindful" of Chinese actions in the South China Sea as well, even as he described India-US defence ties as the "cornerstone" of the overall bilateral relations. "I cannot speak in...