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Refugees fleeing conflict in neighboring Ukraine arrive to in Przemysl, Poland. Street fighting broke out in Ukraine's second-largest city Sunday and Russian troops put increasing pressure on strategic ports in the country's south following a wave of attacks on airfields and fuel facilities elsewhere that appeared to mark a new phase of Russia's invasion. Image Credit: AP

Russian President Vladimir Putin ordered his military command to put Russia's deterrence forces - a reference to units which include nuclear arms - on high alert, citing aggressive statements by NATO leaders and economic sanctions. The United States and NATO condemned the move.

 - Ukrainian and Russian officials were due to meet for talks at a venue on the Belarusian border with Ukraine, President Volodymyr Zelenskiy's office said on Sunday.

 - European nations and Canada moved on Sunday to shut their airspace to Russian aircraft.

 - Japan will join the United States and other Western countries in blocking certain Russian banks' access to the SWIFT international payment system, Prime Minister Fumio Kishida said on Sunday.

 - A decision by Western allies to block certain Russian banks from the SWIFT payments system is likely to lift oil prices well above $100 a barrel as risks with trading Russian oil spike, analysts say.

- Russian military vehicles pushed into Ukraine's second-largest city of Kharkiv on Sunday, on a fourth day of fighting.

- Russia has attacked Ukrainian oil and gas facilities, sparking huge explosions.

- Kremlin-controlled energy giant Gazprom said on Sunday that Russian gas exports via Ukraine to Europe continued normally, in line with requests from customers.

- At least 198 Ukrainians, including three children, have been killed, the head of Ukraine's Health Ministry was quoted as saying. A U.N. relief agency said its estimates showed at least 64 civilians had been killed among 240 civilian casualties, but that the real numbers were likely "considerably higher".

- Ukraine is running out of oxygen supplies that critically ill people need, the World Health Organization said on Sunday, calling for safe passage for emergency imports.

- People fleeing war in Ukraine poured into central Europe, with queues at border crossings stretching for kilometres after the invasion pushed nearly 400,000 people to seek safety abroad.

- Pope Francis called for humanitarian corridors to help refugees out of Ukraine.

- Police detain more than 900 people at anti-war protests across Russia - monitoring group.

- Ukraine lodges case against Russia at world court, citing erroneous allegations of genocide against Kyiv.

- "This is terror. They are going to bomb our Ukrainian cities even more, they are going to kill our children even more subtly. This is the evil that has come to our land and must be destroyed," Zelenskiy said on a short video message.

- "We will hold Russia to account and collectively ensure that this war is a strategic failure for Putin," the leaders of the European Commission, France, Germany, Italy, Britain, Canada and the United States wrote.

 - "As you can see, not only do Western countries take unfriendly measures against our country in the economic dimension - I mean the illegal sanctions that everyone knows about very well - but also the top officials of leading NATO countries allow themselves to make aggressive statements with regards to our country," Putin said on state television.