Russia's invasion of Ukraine four years ago launched Europe's biggest conflict since World War II. It has caused immense suffering for civilians and harrowing ordeals for soldiers while rewriting the post-Cold War security order. The fighting enters its fifth year on Tuesday. A U.S.-based think tank says that as many as 1.8 million soldiers may have been killed, injured or missing on both sides. Another think tank says Russia controls nearly 20% of Ukrainian land. The U.N. says at least 14,999 civilians have been killed in Ukraine.

The latest U.S.-brokered talks between envoys from Moscow and Kyiv over Russia's all-out invasion of Ukraine have ended with no sign of a breakthrough. Both sides said Wednesday the talks were "difficult," as the war's fourth anniversary approaches next week. The negotiations in Switzerland were the third round of direct talks organized by the U.S., after meetings earlier this year in Abu Dhabi that officials described as constructive but which also made no major headway. Expectations for significant progress in Geneva were low. Ukrainian President Volodymyr Zelenskyy accused Russia of "trying to drag out negotiations" while it presses on with its invasion.

Negotiations to end Russia's invasion of Ukraine are showing signs of progress, but major challenges remain, according to a senior Kremlin official. Talks between Ukraine, Russia and the United States in Abu Dhabi were described as constructive, with another round planned for next week. However, no major breakthroughs have been reported. Ukrainian President Volodymyr Zelenskyy also called the talks constructive and mentioned that a document for U.S. security guarantees is ready but needs formal signing. Meanwhile, the war continues, with both sides engaging in drone attacks over the weekend. Negotiators will meet again in early February.

An American proposal to end the war in Ukraine puts the country in a delicate diplomatic position — caught between placating its most important ally, the United States, and not capitulating to Russia, its much larger neighbor that launched a full-scale invasion nearly four years ago. The 28-point peace plan was crafted by the U.S. and the Kremlin, without Ukrainian involvement. It acquiesces to many Russian demands that Ukrainian President Volodymyr Zelenskyy has categorically rejected on dozens of occasions, including giving up large pieces of territory.

President Donald Trump says it's possible that Ukraine can defeat Russia, but he's doubtful that it will happen. The latest comments from Trump added a fresh layer of skepticism toward Kyiv as he plans to meet again with Russian President Vladimir Putin to discuss ending the war. Trump on Monday said Ukrainians "could still win it" but added, "I don't think they will." Trump last month reversed his long-held position that Ukraine would have to concede land and said it could win back all the territory it has lost to Russia. But he changed his position again last week after holding a call with Putin and meeting with Ukrainian President Volodymyr Zelenskyy.

A Ukrainian military official says Russia's invading forces have broken into an eighth region of Ukraine, seeking to capture more ground in their three-year war of attrition as U.S.-led peace efforts struggle to gain traction. Victor Trehubov, spokesman for local ground forces, told The Associated Press that some Russian troops have entered two villages in the eastern Dnipropetrovsk region, a major Ukrainian industrial center next to the Donetsk region where fierce fighting has been taking place. Ukrainian troops are under severe strain as they try to hold back Russia's bigger army.

The second Oval Office meeting in six months between U.S. President Donald Trump and Ukrainian President Volodymyr Zelenskyy went off smoothly, in sharp contrast to their disastrous encounter in February. European leaders joined the discussions in a show of transatlantic unity and both they and Zelenskyy repeatedly thanked Trump for his efforts to end Russia's three-year war on Ukraine. But despite the guarded optimism and friendly banter among the leaders, there was little concrete progress on the main obstacles to ending the war. That deadlock likely favors Russian President Vladimir Putin, whose forces continue to make steady, if slow progress on the ground in Ukraine.