Russian and Ukrainian officials met on the Belarusian border on Monday to discuss a ceasefire but the talks ended with no breakthrough.
Ukraine had said it wanted to secure an immediate ceasefire and the withdrawal of Russian forces while the Kremlin declined to comment on Moscow's goals.
The meeting ended with officials heading back to their respective capitals for further consultations before a second round of negotiations, RIA news agency quoted Ukrainian presidential adviser Mykhailo Podolyak as saying.
Russia calls its actions in Ukraine a "special operation" that it says is not designed to occupy territory but to destroy its southern neighbour's military capabilities and capture what it regards as dangerous nationalists.
The Western-led response has been emphatic, with sanctions that effectively cut off Moscow's major financial institutions from Western markets.
In Brussels, European Union foreign policy chief Josep Borrell said EU sanctions would have a cost for Europe "but we have to be ready to pay the price, or we will have to pay a much higher price in the future".
The EU will provide intelligence to Ukraine about Russian troop movements and EU countries are determined to increase their military support to Kyiv, Borrell said.
France said President Emmanuel Macron spoke to Putin on Monday and urged an immediate ceasefire and an end to attacks on civilians and infrastructure.
Iran described US proposals to end a month of war in the Middle East as "unrealistic, illogical and excessive" on Monday and unleashed more missiles on Israel, as oil prices rose further after Yemen's Houthis entered the conflict.
President Donald Trump said on Monday the United States was in talks with a "more reasonable regime" to end the war in Iran but repeated his warning to Tehran to open the Strait of Hormuz or risk US attacks on its oil wells and power plants.
An Israeli air strike has killed at least three people in the Gaza Strip on Monday, local health officials said, in the latest round of violence since a US-brokered ceasefire took effect more than five months ago.
Spain has closed its airspace to US planes involved in attacks on Iran, a step beyond its previous denial of use of jointly-operated military bases, Spanish newspaper El Pais reported on Monday, citing military sources.
A United Nations peacekeeper has been killed in southern Lebanon overnight, prompting condemnations on Monday after a weekend in which Lebanese journalists and medics were killed in Israeli strikes.
Kuwait's Ministry of Electricity, Water, and Renewable Energy has announced on Sunday that an Iranian attack has killed one worker and damaged a service building at one of its power and water distillation plants.
Iran said it was ready to respond to a US ground attack, accusing Washington on Sunday of preparing a land assault even as the Trump administration sought talks and as regional powers met in Pakistan to try to end the conflict.
Heavy rain that triggered severe flooding and caused buildings to collapse has killed 22 people and injured 32 in Afghanistan over the last two days, the country's National Disaster Management Authority (NDMA) said on Monday, as it warned of continued risk due to bad weather.
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