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Ukraine's President Volodymyr Zelenskiy on Sunday acknowledged Kyiv's forces had withdrawn from Lysychansk in the eastern Donbas region after a grinding Russian assault, but vowed to regain control over the area with the help of long-range Western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.
Widodo has also invited Zelensky to the November 15-16 summit in Bali. The Ukrainian president told Widodo on Wednesday that he will attend the summit depending on who else attends.
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.
Leaders of the Group of Seven wealthy democracies on Monday pledged to stand with Ukraine "for as long as it takes" by cranking up sanctions on Russia and backing security commitments for Kyiv in a post-war settlement.
Xi assures Putin of China's support for Russian 'sovereignty, security'
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.
Medvedev: Russia's reforming president turned arch-hawk
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.
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.
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.
A Russian oligarch was secretly recorded saying Russian President Vladimir Putin has blood cancer, according to media reports.
Video footage from the scene showed fire and rescue workers combing through piles of rubble dousing still smoking wreckage.
This marks the end of the highly successful Roman Abramovich era at Stamford Bridge
A Russian artist faces up to 10 years in jail for protesting against the country's invasion of Ukraine. A local court has put her behind bars for spreading "fake news."
Russian general Alexander Dvornikov, a veteran of Russia's military intervention in Syria, had been named the overall commander of Russian forces in Ukraine.
Abramovich has recently been involved in peace talks between Russia and Ukraine in Turkey
The head of Motoyzhyn village, her husband, and her son were killed by the Russian forces during their occupation of the village near Kyiv, according to Ukrainian officials.
