Ukrainian President Volodymyr Zelensky met Tuesday in Berlin with German Chancellor Friedrich Merz, whose country is one of Ukraine's biggest supporters, as Kyiv battles to defeat Russia's all-out invasion, now in its fifth year.

German Defense Minister Boris Pistorius was also holding talks with his counterpart, Mykhailo Fedorov, the former Ukrainian digital transformation chief who took up his new post in January and is credited with advancing military drone technology.

A former student opened fire at a high school in southeast Turkey on Tuesday, wounding at least 16 people before killing himself, an official said.

The 18-year-old attacker, armed with a shotgun, fired randomly at a vocational high school in Siverek, Sanliurfa province, before hiding inside the building. He later killed himself with the same shotgun, Gov. Hasan Sildak said.

The leaders of China and Spain on Tuesday pledged to strengthen their relations and work to safeguard multilateralism at a time when the world is being impacted by various conflicts, including the recent war in Iran, during a meeting in Beijing on Tuesday.

"We should strengthen communication, consolidate mutual trust, cooperate closely, oppose the world's retrogression to the law of the jungle, and jointly safeguard genuine multilateralism," said Chinese President Xi Jinping during a reception for Spanish Prime Minister Pedro Sánchez at the Great Hall of the People.

Pakistan's Prime Minister Shehbaz Sharif said on Monday a ceasefire between the United States and Iran was "holding" and that efforts were underway to reach an agreement after weekend talks failed to do so.

Pakistani, Egyptian and Turkish mediators will continue talks with the U.S. and Iran in the coming days in an effort to bridge the remaining gaps and reach a deal to end the war, a regional source and a U.S. official told U.S. news portal Axios.

"All parties still believe a deal is possible. The mediators hope that narrowing the gaps could enable another round of negotiations before the ceasefire expires on April 21," Axios said.

U.S. President Donald Trump said Sunday he does not care if Iran comes back to negotiations with the United States after talks in Pakistan failed to produce a deal.

"I don't care if they come back or not. If they don't come back, I'm fine," Trump told reporters at Joint Base Andrews in Maryland, upon his return from Florida.

The U.S. military said it would begin a blockade of all Iranian ports Monday, after talks between the warring sides in Pakistan collapsed, and despite the Iranian military warning that it would treat any such action as an act of piracy.

Trump had announced on social media he would blockade the strategic Strait of Hormuz trade route that he has been demanding Tehran fully re-open, after Vice President JD Vance left negotiations with an Iranian delegation in Islamabad.

Pope Leo XIV on Monday began a landmark visit to Algeria in the first trip to the Muslim-majority country by a pontiff.

Pope Leo XIV on Monday said he had "no intention to debate" with Donald Trump, after the U.S. president criticized him over his comments on the U.S.-Iran war.

Turkey's foreign minister said on Monday he believed Iran and the United States are "sincere" about reaching a ceasefire despite the failure of Pakistan-mediated talks on the weekend.