Ukrainian President Volodymyr Zelensky called Johnson to express his "sadness" over his resignation.
Ukraine's President Volodymyr Zelenskiy on Sunday acknowledged Kyiv's forces had withdrawn from Lysychansk in the eastern Donbas region after a grinding Russian assault, but vowed to regain control over the area with the help of long-range Western weapons.
Ukraine's President Volodymyr Zelensky called for the United Nations to visit the site of a missile strike on a shopping mall in the city of Kremenchuk, as he addressed the UN Security Council on Tuesday.
NATO's first new strategy concept in a decade will cite China as a concern for the first time but member states remain at odds over how to describe the country with the world's largest military and its relationship with Russia, NATO diplomats say.
British Prime Minister Boris Johnson warned his fellow G7 leaders not to give in to "fatigue" and said Ukraine would need long-term help.
Prime Minister Boris Johnson said on Thursday Britain was willing to assist with demining operations off Ukraine's southern coast and was considering offering insurance to ships to move millions of tonnes of grain stuck in the country.
On Friday, Johnson's Downing Street office said Britain stood ready to offer Zelensky a major new training programme with the potential to train 10,000 new and existing Ukrainian soldiers every 120 days.
Russia has arrested a 33-year-old belly dancer named Yekaterina 'Katya' Zavalishina, in connection with an espionage case.
Russia has barred as many as 29 UK journalists, including journalists from the BBC, the Guardian, Times and the Independent, from entering the country.
Many in attendance spoke of a massive surge in demand as countries ramp up production, both to send munitions to Ukraine and to beef up their own arsenals.
The Taliban have put a fashion model, Ajmal Haqiqi, and his three colleagues in jail for allegedly insulting Islam and the Quran.
A former British soldier, who was discharged from service in March, has died fighting Russian forces in Ukraine, according to a statement from his family.
In a bizarre and shocking incident reported from the Indian state of Odisha, an elephant killed a 70-year-old woman.
Britain on Friday condemned Russian proxy authorities in Donbas for what it called an "egregious breach" of the Geneva convention in sentencing to death two British nationals captured in the separatist region while fighting for Ukraine.
Russia is attacking food and agriculture targets in Ukraine in order to scare the world into agreeing a deal to reopen the Black Sea on Moscow's terms, the head of the region where a major agricultural storage facility was struck on Sunday said.
Grain silos in Ukraine's government-controlled territory are about half full in the run-up to this year's harvest, meaning crops could be left in the ground if Russia continues its port blockade, the head of the Ukraine Grain Association said on Wednesday.
Ukrainian forces struggled to hold their ground in bloody street-to-street fighting in the eastern frontline city of Sievierodonetsk as President Volodymyr Zelenskiy said the situation was difficult, also pledging to retake Russia's gains.
Ukrainian and Russian troops fought street by street for control of the industrial city of Sievierodonetsk on Monday in a pivotal battle of the Kremlin offensive in Ukraine's eastern Donbas region.
Ukrainian President Volodymyr Zelenskiy said on Sunday he had traveled to Lysychansk and Soledar, two cities very close to some of the most intense fighting between his country's troops and Russian forces.
U.N. aid chief Martin Griffiths is in Moscow on Thursday and Friday to discuss clearing the way for exports of grain and other food from Ukraine's Black Sea ports, a U.N.
The situation on the eastern frontline in Donbas has become increasingly desperate, with Ukrainian towns facing near constant shelling from Russian forces.
Russia's foreign minister Sergei Lavrov has dismissed all rumours around Vladimir Putin's health.
A pregnant Sumatran elephant was found dead of suspected poisoning in Indonesia's Riau province.
European Union leaders agreed on Monday to ban most imports of Russian oil to the 27-nation bloc as Ukrainian and Russian forces battled on the outskirts of Sievierodonetsk, the last city still held by Kyiv in Ukraine's strategic Luhansk province.
A top Ukrainian official has claimed that Russian president Vladimir Putin had managed to survive an assassination attempt two months ago.
As many as 200 rotting corpses were found in the basement of an apartment building in Mariupol.
Male journalists in Afghanistan came out in support of their female colleagues who have been asked by the Taliban to cover their faces on-air.
A three-year-old military dog abandoned by Russian soldiers in Ukraine is now assisting Ukrainian soldiers in sniffing out unexploded mines.
The latest company that has decided to pull out of Russia due to its war in Ukraine is the famous coffee chain Starbucks. It has now joined the list of firms that have stopped offering their services in the country.
It seems that the Taliban will only rest after ensuring that all Afghan women have been stripped off their rights and dignity. In their latest diktat, they have asked female TV presenters to cover their faces while on air.