LVIV, Ukraine (AP) — Ukrainian President Volodymyr Zelenskyy accused the West of lacking courage as his country fights to stave off Russia’s invasion, making an exasperated plea for fighter jets and tanks to sustain a defense in a conflict that has ground into a war of attrition.

Speaking after US President Joe Biden said in a lacerating speech that Russian President Vladimir Putin could not stay in power — words the White House immediately sought to downplay — Zelenskyy lashed out at the West’s “ping-pong about who and how should hand over jets” and other weapons while Russian missile attacks kill and trap civilians.

“I’ve talked to the defenders of Mariupol today. I’m in constant contact with them. Their determination, heroism and firmness are astonishing,” Zelenskyy said in a video address early Sunday, referring to the besieged southern city that has suffered some of the war’s greatest deprivations and horrors. “If only those who have been thinking for 31 days on how to hand over dozens of jets and tanks had 1 percent of their courage.”

Russia’s invasion of Ukraine, now in its 32nd day, has stalled in many areas, its aim to quickly encircle the capital, Kyiv, and force its surrender faltering in the face of staunch Ukrainian resistance — bolstered by weapons from the US and other Western allies.

Britain’s defense ministry said Russia’s troops looked to be trying to encircle Ukrainian forces directly facing the two separatist-held areas in the country’s east. That would cut the bulk of Ukraine’s military off from the rest of the country.

Moscow claims its focus is on wresting from Ukraine the entirety of the eastern Donbas region, which has been partially controlled by Russia-backed separatists since 2014. A high-ranking Russian military official said Friday that troops were being redirected to the east from other parts of the country.

Ukraine says that to defeat Russia, it needs fighter jets and not just the missiles and other defensive weapons supplied so far by the West. A proposal to transfer Polish planes to Ukraine via the United States was scrapped amid NATO concerns about getting drawn into a military conflict with Russia.

In his pointed remarks, Zelenskyy accused Western governments of being “afraid to prevent this tragedy. Afraid to simply make a decision.”

“So, who is in charge of the Euro-Atlantic community? Is it still Moscow, thanks to its scare tactics?” he said. “Our partners must step up their aid to Ukraine.”