The US said it welcomes the nuclear agreement signed between India and Sri Lanka during President Maithripala Sirisena's visit to Delhi earlier this week.
State Department spokesperson Jen Psaki told a press briefing on Tuesday the US was aware of the announcement and welcomed regional cooperation.
"We welcome regional cooperation on nuclear energy that is consistent with IAEA safeguards and other international standards and practices," she said.
The deal will see India assist Sri Lanka to build its nuclear energy infrastructure, the Indian foreign ministry said on Monday.
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Indian Prime Minister holds talks with Sri Lankan President in Delhi (16 February 2015)