Despite a five-hour-long operation on Monday, South Korea failed to shoot down the North Korean drones, prompting widespread criticism over the response and an apology from the country's military.
Seoul seeks to deploy airborne lasers to destroy drones and jammers to neutralise smaller devices two days after the reported incursion of North Korean drones.
Preliminary talks, which may not lead to any deals, come as the Southeast Asian nation seeks new suppliers and Ukraine conflict strains capabilities of Russia, for decades Vietnam's main military partner.
An overnight attack left the southern Ukrainian port city without power, local authorities say as the conflict enters its 289th day.
Washington alleges Moscow "is offering Iran an unprecedented level of military and technical support — that is transforming their relationship into a fully fledged defense partnership."
A Ukrainian investigation found that Iranian-built drones Russian forces are using in Ukraine consist of components made in the US and Europe.
Russian authorities, who initially dismissed talk of evacuating Kherson, sharply changed course this week, warning that the city could come under massive Ukrainian shelling and encouraging residents to leave.
Russia says it will reassess cooperation with UN chief Antonio Guterres if he sends experts to Ukraine to inspect downed drones that Western powers claim were made in Iran and used by Moscow, as fighting enters its 239th day.
Iran says it is ready for talks with Ukraine to clarify "baseless" claims that Tehran is providing Moscow with weapons and drones to be used in the conflict, now in its 237th day.
Ukrainian foreign minister Kuleba is submitting a proposal to President Zelenskyy, which aims to formally cut ties diplomatic ties with Iran over supplying Russia with deadly drones, as Tehran denies any such involvement in the conflict.
Afghanistan's defence minister demands Pakistan not allow its airspace to be used by the US military, while Islamabad denies the accusation and cites a lack of evidence.
Sophisticated weekend attack involving drones, explosives, car bombs and artillery leaves 42 soldiers dead and 22 others wounded, say officials of the troubled African country.
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