His remarks came a day after Amir Saeid Iravani, Iran's ambassador to the UN, told Iranian journalists in New York that Tehran would "decisively respond" to any attack on the country, according to the state-run IRNA news agency.

Iranian officials warned that Tehran would decisively respond to any U.S. attacks, as President Biden vowed unspecified action following the deaths of three American soldiers in Jordan. "We hear threats coming from American officials, we tell them that they have already tested us, and we now know one another, no threat will be left unanswered," Iranian Revolutionary Guards' chief Hossein Salami said on Wednesday, Reuters reported, citing the semi-official Tasnim news agency. "We are not after war, but we have no fear of war," Salami, who answers only to Supreme Leader Ayatollah Ali Khamenei, said at an event Wednesday, according to the state-run IRNA news agency. Another warning came from Amir Saeid Iravani, Iran's ambassador to the United Nations in New York. UNITED NATIONS SPOX INSISTS'UNRWA DOES NOT WORK WITH HAMAS' DESPITE CLAIMS EMPLOYEES PARTICIPATED IN OCT. 7 FILE - Iran's United Nations Ambassador Amir Saeid Iravani addresses the U.N. General Assembly at U.N. headquarters on Feb. 23, 2023.

Four people in two villages in Ukraine's northern Sumy region near the Russian border were killed in Russian shelling, while a woman died in a new assault on the devastated eastern Ukrainian town of Avdiivka, according to local officials. Three people were also reported injured after Russian drones hit Kharkiv, Ukraine's second-largest city, according to local officials. The attack also started a fire and caused damage to apartment blocks and infrastructure. Ukraine's Air Force said Russia launched a total of 35 attack drones and two guided missiles targeting energy and military infrastructure near the front line and other Ukrainian regions, with air defence systems destroying 15 of the 35 drones. Russia said it brought down 11 drones launched by Ukraine over Crimea, which it occupied and annexed in 2014 in a move that was not recognised internationally.

President Biden said on Tuesday that he had decided on a U.S. response to the drone attack on a remote outpost in Jordan on Sunday that killed three American soldiers and injured more than 40 others, leaving unstated what that decision was. Asked by reporters outside the White House whether he had decided on a response to the lethal attack, Mr. Biden said, "Yes" but declined to provide further details. John F. Kirby, a National Security Council spokesman, refused to elaborate on Mr. Biden's remarks other than to say it was "very possible" that the United States would carry out "a tiered approach" -- "not just a single action, but potentially multiple actions" over a period of time. Biden administration officials have blamed an explosives-laden drone, most likely launched by an Iran-backed militia in Iraq, for the attack -- the most deadly of the more than 160 militia attacks the Pentagon says U.S. forces have come under in the region since the start of the war between Israel and Hamas in Gaza nearly four months ago. Mr. Biden has vowed to retaliate and has met twice this week with his national security aides to discuss targets in Syria, Iraq and Iran.

In the multiple unmanned aerial vehicle (UAV)- assisted downlink communication, it is challenging for UAV base stations (UAV BSs) to realize trajectory design and resource assignment in unknown environments. The cooperation and competition between UAV BSs in the communication network leads to a Markov game problem. Multi-agent reinforcement learning is a significant solution for the above decision-making. However, there are still many common issues, such as the instability of the system and low utilization of historical data, that limit its application. In this paper, a novel graph-attention multi-agent trust region (GA-MATR) reinforcement learning framework is proposed to solve the multi-UAV assisted communication problem. Graph recurrent network is introduced to process and analyze complex topology of the communication network, so as to extract useful information and patterns from observational information. The attention mechanism provides additional weighting for conveyed information, so that the critic network can accurately evaluate the value of behavior for UAV BSs. This provides more reliable feedback signals and helps the actor network update the strategy more effectively. Ablation simulations indicate that the proposed approach attains improved convergence over the baselines. UAV BSs learn the optimal communication strategies to achieve their maximum cumulative rewards. Additionally, multi-agent trust region method with monotonic convergence provides an estimated Nash equilibrium for the multi-UAV assisted communication Markov game.

An Iran-backed militia group in Iraq says it is suspending attacks on U.S. troops after a drone attack killed three soldiers early Sunday, but the Department of Defense is casting doubt on those claims. The Iraq-based Kataeb Hezbollah said Tuesday it was suspending "military and security operations against the occupying forces to avoid any embarrassment for the Iraqi government." Gen. Ryder speaks during a press briefing at the Pentagon on Tuesday, Jan. 23, 2024 in Washington. The group is one of multiple Iranian proxies in the region that are believed responsible for carrying out attacks on U.S. targets in Iraq, Syria, and, most recently, Jordan over the past several months. The groups say the attacks are in retaliation for U.S. support of Israel in its ongoing offensive against Hamas militants in Gaza and the mounting death toll of Palestinian civilians.

On Sunday, January 28, The Islamic Resistance in Iraq, an umbrella group that includes the militias Kataib Hezbollah and Harakat al-Nujaba among others, claimed responsibility for a drone attack that killed three US military personnel and injured 34 others in a base in northeastern Jordan, near the Syria border. In the media coverage of the attack, it was repeatedly mentioned that these militias have launched 165 attacks on US troops – 66 in Iraq and 98 in Syria – since October 2023. While it helps put the attack in context, this is a misleading figure. This conflict began much earlier than last October, and thus the total number of attacks the US has faced from these militias is actually much higher. Indeed, Sunday's drone attack was just the latest episode in an undeclared war between the United States and Iran-affiliated Iraqi Shia militias that has been raging across the region for more than five years. More than six years ago, in October 2017, in an article published on this very page, I predicted that US President Donald Trump's controversial decision to withdraw from the Joint Comprehensive Plan of Action, or the "Iran nuclear deal", would result in attacks by Iran-backed Iraqi militias on US forces in Iraq and across the region.

Oneida and Shawn Sanders remember their daughter, 24-year-old Spc. Kennedy Ladon Sanders, as a goal-oriented and competitive person who loved serving her country. The parents of one of the U.S. soldiers killed in a drone strike in Jordan spoke out Tuesday morning about the loss of their daughter, as they await a phone call from President Biden. Kennedy's parents, Oneida and Shawn Sanders joined "Fox & Friends" to discuss the unexpected loss and how they want America to respond to the deadly attack that took their daughter's life. "As a grieving parent, I would not want to see any other parent go through what we're going through right now, but given the circumstances, our child and the others who lost their lives are considered heroes in this situation," Oneida said.

Near the Ukrainian city of Avdiivka, a boxy robot zips along the rocky, cracked road. Snaking from side to side, the robot--a four-wheeled machine, around knee height--carries cargo and ammunition for Russian troops. Hovering above the road, tracking the movements of the robot, is a Ukrainian drone. The attack, which happened in early December and was claimed by the Ukrainian military's 110th Mechanized Brigade, is one of a small, but growing, number of incidents where unsophisticated robots have been used against other robots in Russia's war in Ukraine. Aerial drones have been used to surveil or attack ground robots, soldiers have attached weapons to land-based robots, and other small unmanned bots are being fitted with jamming technology to knock drones from the sky.

"Three U.S. service members were killed -- and many wounded -- during an unmanned aerial drone attack on our forces stationed in northeast Jordan near the Syria border," Mr. Biden said in a statement on Sunday. "While we are still gathering the facts of this attack, we know it was carried out by radical Iran-backed militant groups operating in Syria and Iraq." Speaking later in Columbia, S.C., Mr. Biden said, "We lost three brave souls." The president then led a moment of silence, before adding, "We shall respond." Defense Secretary Lloyd J. Austin III also held Iran-backed militias responsible for the continued attacks against U.S. troops in the region, but he did not identify which country the attack was launched from.