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.
Thailand and Cambodia plan to rebuild mutual trust and gradually consolidate a ceasefire after weeks of border clashes, Beijing said in a communique with the two countries following talks in southwestern China.
Three Turkish police officers and six ISIS fighters were killed in a gunfight in northwest Turkey on Monday, the Interior Minister said, a week after more than 100 suspected ISIS members were detained for planning Christmas and New Year attacks.
A fire at a retirement home in the city of Manado on Indonesia's on Sulawesi island has killed 16 people, a local police official was quoted as saying on Monday by state news agency Antara.
US President Donald Trump said on Sunday that he and Ukrainian President Volodymyr Zelenskyy were "getting a lot closer, maybe very close" to an agreement to end the war in Ukraine, while acknowledging that the fate of the Donbas region remains a key unresolved issue.
China staged live-fire drills around Taiwan on Monday, deploying troops, warships, fighter jets and artillery for its "Justice Mission 2025" exercises, as the island scrambled soldiers and showcased US-made hardware to rehearse repelling an attack.