Ukraine invasion: Russia's attack in maps
Russia has launched a major invasion of Ukraine from three main directions.
Reports say troops are advancing from the north in the direction of Kyiv; from the east through Donetsk, Luhansk and Kharkiv; and from Crimea in the south.
In less than 24 hours, dozens of targets have been struck, as Russian troops have poured into Ukraine.
Attack from the air
From approximately 03:00GMT, explosions were heard in many cities across the country, as Ukraine's air defences and other military infrastructure came under attack.
Analysts say that strikes from the air are aimed at clearing the way for ground troops to move in.
Among the targets were locations in Kyiv, Karkhiv, Odesa and Ivano-Frankivsk.
Strike from the north
From the north, Russian troops are believed to have crossed the border into Ukraine at the three-way junction between Ukraine, Russia and Belarus, at Senkivka.
In recent weeks, a huge deployment of Russian troops has gathered close to Novye Yurkovichi and Troebortno, including "the entire 41st army", according to Michael Kofman of the US-based Center for Naval Analyses.
Armoured columns, including tanks and multiple launch rocket systems, have moved towards Chernihiv, on a direct path to Kyiv.
There has also been fighting on the outskirts of the capital, as Ukrainian forces try to recapture Antonov airbase to the west of the city.
Russian airborne troops took control of the Gostomel airfield, but Ukraine's president, Volodymyr Zelensky, vowed that they would be encircled and crushed.
A missile strike also hit the town of Brovary, east of Kyiv.
Russian forces are reported to have captured the former nuclear plant at Chernobyl.
Strike from the east
From the east, there are reports that Russian tanks have arrived in Kharkhiv, Ukraine's second-largest city. Parts of the city have been shelled.
Overnight, there were large explosions in Donetsk, and similar blasts coming from the direction of Belgorod across the border, where large troop movements were reported on Wednesday.
Image source, Getty ImagesSeparately, Russia's Interfax news agency reported claims from Russian-backed separatists that they had launched an offensive on the Ukrainian-controlled town of Shchastia in Luhansk.
There was also fierce fighting around Sumy, near Kharkiv.
There are thought to be about 15,000 Russian-backed separatists in Donetsk and Luhansk, who may help a Russian advance. Ukraine believes the figure is higher.
Strike from the south
In the south, troops have crossed from from Crimea to the mainland, towards Kherson, taking Chongar and Novo Alekseyevka.
Overnight, explosions were heard in cities across the region, including Odesa, Mariupol, Melitpol and Kherson.
Ukrainian officials - quoted by the Reuters news agency - said Russian troops had landed in the ports of Odesa and Mariupol.
Image source, Getty ImagesIn recent days, Russia had positioned landing ships capable of deploying main battle tanks, armoured vehicles and personnel, off the Ukrainian coast in a major build-up in the Black Sea and the Sea of Azov.
Ukrainian forces are concentrated in the east of Ukraine, towards Donetsk and Luhansk,
Ben Barry, of the International Institute for Strategic Studies, says that a Russian advance north from Crimea may succeed in cutting them off from Kyiv, stranding them on the east side of the Dnieper River.
With Russian troops to their east, in Donetsk and Luhansk, north in Russia, and on the west bank of the Dnieper, they would be encircled.
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