Food supplies were distributed to 80 households
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."
Food supplies were distributed to 80 households
On January 31, a heart was airlifted from Delhi to Chennai, paving the way for Ayesha Rashid's life-saving surgery
The online retailer, which is headquartered in Singapore, has said it has around 108 million monthly active users in the 27-nation EU
The baby girl named Rouh, meaning Soul, suffered respiratory problems and a weak immune system, a doctor at the Emirati Hospital in Rafah said
Specialised teams are currently managing the situation by cleaning up and removing the dead fish
The charges against them include planning terrorist acts, fundraising for the Organisation, and concealing the source and destination of those funds
Eyewitnesses are reporting that the fire seems to be located in the industrial area
In the video shared by the Abu Dhabi Police, speeding cars are seen crashing into vehicles as traffic builds up unexpectedly