India, Sept. 18 -- US President Donald Trump has warned countries where illegal drug trafficking and narcotics production is rampant that they face "serious consequences" if they fail to curb the flow of illegal substances, with India among the 23 nations placed on Washington's latest watchlist.

In his annual Presidential Determination submitted to Congress, Trump identified India, Pakistan, China and Afghanistan alongside 19 other nations as "major drug transit or major illicit drug producing countries." The full list includes The Bahamas, Belize, Bolivia, Burma, Colombia, Costa Rica, the Dominican Republic, Ecuador, El Salvador, Guatemala, Haiti, Honduras, Jamaica, Laos, Mexico, Nicaragua, Panama, Peru and Venezuela.

The US government...