Russian President Vladimir Putin announced a military operation in Ukraine on Thursday with explosions heard soon after across the country and its foreign minister warning a "full-scale invasion" was underway.

- Ukraine has imposed martial law after Russia declared war today. Reports of Russian troops laying siege in various parts of Ukraine have come up.

- Ukraine says it has closed its airspace for civilian flights because of a ‘high risk’ to safety.The government moved to clear the Kyiv airport after Russia declared war on it. Passengers and staff are being evacuated from Kyiv airport.

- Air raid sirens have gone off in Kyiv, indicating that the city is under attack. The sirens were heard in multiple live television reports from Ukraine.

- Air India flight AI1947 is coming back to Delhi due to NOTAM (Notice to Air Missions) at Kyiv in Ukraine, reports news agency ANI. Earlier, another special flight carrying Indian nationals, including students, had landed safely in New Delhi.

- Diplomats from dozens of countries took the floor at the United Nations on Wednesday to deplore Russia’s actions toward Ukraine and make eleventh hour pleas for diplomacy as fears of a new war in Europe grew.

- But even China, which usually takes Moscow’s side at the UN, spoke up for the world body’s longstanding principle of respecting countries’ sovereignty and internationally recognised borders.

- Air raid sirens have gone off in Kyiv, indicating that the city is under attack. The sirens were heard in multiple live television reports from Ukraine.

- Sensex bleeds 1,600 pts, Nifty below 16,600 on Ukraine crisis; all index stocks in red; India VIX surges 30%