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Ukrainian President Volodymyr Zelenskyy on Monday urged western nations to toughen sanctions quickly against Russia , including an oil embargo, to stop Moscow having escalating its measures against his country.
In his nightly video address to Ukrainians, a clearly irritated Mr Zelenskyy said the West had miscalculated last year in delaying sanctions and the invasion had followed.
"A full-scale war has begun," he said, occasionally banging his hands against a table.
"Now there are many hints and warnings that supposedly tougher sanctions, such as an embargo on Russian oil supplies to Europe , will be put in place if Russia uses chemical weapons .
"There are simply no words ... We, people who are alive, have to wait. Doesn't everything the Russia military has done to date warrant an oil embargo?
"Don't phosphorus bombs warrant it? A shelled chemical production facility or a shelled nuclear power plant doesn't warrant it?"
Russia's month-old invasion of Ukraine , the biggest European conflict since the Second World War, has seen over 3.8 million Ukrainians flee abroad, left thousands dead or injured and isolated Russia 's economy.
Mr Zelenskyy said sanctions had to be "effective and serious" given Russia's actions to date.
"If the sanctions packages are weak or do not work strongly enough, if they can be circumvented, it creates a dangerous illusion for the Russian leadership, as if they will be permitted to continue doing what they are doing now," he said.
"Ukrainians are paying for this with their lives. Thousands of lives."
The United States has already introduced an embargo on Russian oil shipments.
But Europe, far more dependent on Russian energy, has been more hesitant.
Germany, Europe's largest economy, has said introducing such an embargo would trigger recession and mass unemployment .
A woman walks past a poster depicting Russian President Vladimir Putin holding his own body, as Russia's invasion of Ukraine continues, in Sofia, Bulgaria. Reuters
A man walks past a residential area destroyed by a rocket strike in Kyiv. Getty Images
Ukraine refugees wait in the train station in Przemysl, near the Polish-Ukrainian border. More than 3.8 million have fled Ukraine since Russia's invasion. AFP
Ukrainian civilians receive weapons training at a shooting range in Brno, Czech Republic. EPA
A Ukrainian special police officer patrols near a destroyed building during the night curfew in Kharkiv. AP Photo
A Ukrainian serviceman walks past the wreck of a Russian tank in Lukyanivka, Kyiv. Reuters
Ukrainian Air Force jets take part in a defence drill over an unidentified location. Reuters
Valentina Demura, 70, near the ruins of her home in apartment block in the besieged southern port city of Mariupol. Reuters
A message of support for Ukraine at the 94th Academy Awards in Hollywood, Los Angeles, California. Reuters
The widow of sergeant Kostiantyn Deriuhin stands at her husband's grave after his funeral at Lychakiv cemetery in Lviv, Ukraine. Reuters
A walk amid the ruins after a Russian attack in Byshiv on the outskirts of Kyiv, Ukraine. AP
A soldier of the Ukrainian territorial defence forces gives a salute during a break in digging a foxhole at Kalynivka, on the outskirts of Kyiv, Ukraine. AP
A bust adorned with a headband in the colours of the Ukraine flag at a checkpoint in Kyiv, Ukraine. AP
The Cheremosh Folk Song and Dance Ensemble performs in the streets of the Old Town in Lviv, Ukraine. Getty
Eugene Grigorash says goodbye to his wife Victoria Grigorash and their seven-month-old son Roman as their bus leaves Lviv on its way to Poland. Getty
People head for an air raid shelter after sirens sound across Lviv in Ukraine. Getty
A pro-Ukraine rally at the Lincoln Memorial in Washington. EPA
The aftermath of an air strike on the western Ukrainian city of Lviv. AFP
A protester weeps as she takes part in a 'mothers' march' for Ukraine, in New York. AFP
Local people share a basement of a historical building which is being used as a bomb shelter during an air raid warning in Lviv. EPA
US President Joe Biden kisses a child while meeting refugees of Russia's war with Ukraine at PGE Narodowy Stadium in Warsaw, Poland. AFP
A Ukrainian soldier stands guard at Independence Square in Kyiv. AFP
Municipal employees cover the city's monuments with sand bags to protect them from strikes in Kharkiv. AFP
Misha, 5, who lost his mother some weeks ago and got injured during a Russian strike, is helped by his grandfather to dress up in the basement of a hospital in Mykolaiv. AFP
Ukrainian refugees rest in the ticket hall of Przemysl Glowny train station. Reuters
A woman walks past destroyed houses in the village of Krasylivka outside Kyiv. Reuters
A man climbs up a ladder to examine his destroyed house in the village of Krasylivka outside Kyiv. Reuters
Damage inside an Orthodox Church building in Yasnohorodka, on the outskirts of Kyiv. AP
A Ukrainian soldier at a psychiatric hospital damaged by a Russian bombing, in Mykolaiv. AP
Displaced people from Dnipro arrive in Lviv, in western Ukraine. Millions are internally displaced. Getty Images
A destroyed school in Kharkiv. AFP
A Ukrainian fighter on the front line in the north Kyiv region. Reuters
A resident walks past blazing buildings and vehicles after a Russian artillery strike in Kharkiv. AFP
Black smoke billows from a fuel depot near Kyiv that was used by the Ukrainian Army before it was hit by during a Russian strike. AP
Masha, 26, checks her mobile phone at an air raid shelter inside a Kyiv metro station. Reuters
A market on fire in Kharkiv after a Russian attack. AP
People try to recover items from a shop set on fire during a Russian attack in Kharkiv. AP
Nastya Kuzyk, 20, who was injured in an attack on Chernihiv, is comforted by her mother Svitlana, 50, as she recovers in a Kyiv hospital. AP
Updated: March 28, 2022, 11:16 PM