Ukraine ceasefire talks begin

Ceasefire talks between Russian and Ukrainian officials began on the Belarusian border on Monday as Russia faced deepening economic isolation.

Russian forces seized two small cities in southeastern Ukraine and the area around a nuclear power plant, the Interfax news agency said.

But they ran into stiff resistance elsewhere as the biggest assault on a European state since World War Two failed to make as much ground as some had expected.

Talks began with the aim of an immediate ceasefire and the withdrawal of Russian forces, the Ukrainian president's office said. Russia has been cagier about the talks, with the Kremlin declining to comment on Moscow's aim.

It was not clear whether any progress could be achieved after Russian President Vladimir Putin put Russia's nuclear-armed units on high alert on Sunday.

"Dear friends, the President of Belarus has asked me to welcome you & facilitate your work as much as possible. As it was agreed with the Presidents (Volodymyr) Zelenskiy and Putin, you can feel completely secure," Belarusian Foreign Minister Vladimir Makei said at the start, according to the foreign ministry's translation on Twitter.

Russia's rouble currency plunged 30% against the dollar on Monday. Countries also stepped up weapons supplies to Ukraine.

Battle for the cities

Blasts were heard before dawn on Monday in the capital Kyiv and in the northeastern city of Kharkiv, Ukrainian authorities said. But Russian ground forces' attempts to capture major urban centres had been repelled, they added.

The Ukrainian General Staff said Russian forces were focusing on Chernihiv city, northeast of Kyiv, and parts of Donetsk region in the east among other areas.

Kyiv authorities warned residents emerging from a weekend curfew that they would see newly erected fortifications, tank traps and other defensive installations in the streets as the city girds for further battle.

Russia's defence ministry said its forces had taken over the towns of Berdyansk and Enerhodar in Ukraine's southeastern Zaporizhzhya region as well as the area around the Zaporizhzhya nuclear power plant, Interfax reported. The plant's operations continued normally, it said.

Ukraine denied that the nuclear plant had fallen into Russian hands, according to the news agency.

Dozens of people were killed in Russian rocket strikes on Kharkiv on Monday, Ukrainian interior ministry adviser Anton Herashchenko said.

U.N. human rights chief Michelle Bachelet said at least 102 civilians in Ukraine have been killed since Thursday, with a further 304 wounded, but the real figure is feared to be "considerably higher".

More than half a million people have fled to neighbouring countries, according to the United Nations refugee agency.

Fighting took place around the Ukrainian port city of Mariupol throughout the night, Pavlo Kyrylenko, head of the Donetsk regional administration, said. He did not say whether Russian forces had gained or lost ground, or provide any casualty figures.

A U.S. defence official said Russia had fired more than 350 missiles at Ukrainian targets since Thursday, some hitting civilian infrastructure.

Weapons

Partners in the U.S.-led NATO (North Atlantic Treaty Organization) defence alliance were providing Ukraine with air-defence missiles and anti-tank weapons, NATO chief Jens Stoltenberg said.

The Kremlin accused the European Union of hostile behaviour, saying weapons supplies to Ukraine were destabilising and proved that Russia was right in its efforts to demilitarise its neighbour.

"Throughout Russia, the vast majority of the population has friends or relatives who live in Ukraine. Naturally, everyone's hearts are aching for what is happening to these relatives," Kremlin spokesperson Dmitry Peskov said.

The Kremlin declined to comment on whether there was a risk of confrontation between Russia and NATO. Russia has demanded that NATO never admit Ukraine.

Over the weekend, Western nations announced sanctions including blocking some Russian banks from the SWIFT international payments system.

In an emergency move, Russia's central bank raised its key interest rate to 20 percent from 9.5 percent. Authorities told export-focused companies to be ready to sell foreign currency.

It also ordered brokers to block attempt by foreigners to sell Russian securities.

Corporate giants also took action in response to the sanctions, with British oil major BP BP, the biggest foreign investor in Russia, saying it would abandon its stake in state oil company Rosneft at a cost of up to $25 billion.

The EU shut all Russian planes out of its airspace, as did Canada, forcing Russian airline Aeroflot to cancel all flights to European destinations until further notice.