The decision laid down conditions and controls for plant-production practices on small farms, improving marketing opportunities for local products
Pompeo spoke with counterparts from the Association of Southeast Asian Nations in an annual conference by video due to the coronavirus pandemic.
Although the US lays no claim to the South China Sea, the Trump administration has recently imposed sanctions on Chinese officials responsible for Beijing's military buildup in the area.
"I think keep going, don't just speak up but act," Pompeo told top diplomats from the 10-nation bloc, without elaborating. A State Department spokeswoman said he pressed for a peaceful resolution of the disputes.
China does not respect democratic values and principles of sovereignty, quality and territorial integrity enshrined in the Asean charter, Pompeo said.
He cited the US blacklisting of about two dozen Chinese companies for their roles in constructing artificial islands in the disputed waters that infringe on other states' claims.
"Reconsider business dealing with the very state-owned companies that bully Asean coastal states in the South China Sea," Pompeo said.
"Don't let the Chinese Communist Party walk over us and our people. You should have confidence and the American will be here in friendship to help you," he said.
It's not clear how many Asean members have dealings with the Chinese construction companies blacklisted by the US Commerce Department.
But Philippine President Rodrigo Duterte's administration said last week it would not follow the US move and will allow one of the blacklisted firms or its subsidiary to partner with a local company for an airport project in Cavite province south of Manila.
The US has challenged China's sweeping territorial claims by deploying warships and fighter jets for what it calls freedom of navigation and overflight patrols in the disputed waters.
There was no immediate comment from China or its foreign minister, Wang Yi, who was participating in the Asean meetings and separately met the group's ministers Wednesday.
Vietnamese Foreign Minister Pham Binh Minh, whose country is hosting Asean meetings this year, warmed up to Pompeo's remarks, saying "the Asean-US relationship has brought about mutual benefit to both sides".
"The US role and contribution to maintaining peace, stability and security in the region are encouraged," he said.
Asean, founded in 1967, has struggled to stay away from the escalating rivalry between Washington and Beijing.
Depending on how Asean deals with issues, "they can either result in disaster or a new dawn of peace and stability for our region," Malaysian Foreign Minister Hishammuddin Hussein told colleagues on Tuesday.
"The challenge here is leadership - do we lead or do we follow?" he asked. "Make no mistake - Southeast Asia intends to remain the master of its own destiny."
The decision laid down conditions and controls for plant-production practices on small farms, improving marketing opportunities for local products
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