Zelensky promised to join Nato and EU before he became a president, that was literally the platform he ran on and people voted for him because they wanted to join EU as well, and that is how he became the president and this was during Trump, Biden wasn't even elected. Then Ukraine officially declared they want to join and only thing Biden could be guilty of would be saying they are fine with Ukraine joining and Russia should back off.
I confirm the condition of the President of Ukraine's alignment with NATO and the EU long before Biden became president, but you cannot deny that the close relationship between the President of Ukraine and Biden is related to an energy business. Since Trump's time, he has asked the President of Ukraine to summon Biden's son regarding his business matters. Is it possible that the political lobby always has us someone in office? I do not condone Russia's actions, but Ukraine must be wise in responding to its country's geopolitical conditions, which indeed cannot ignore the existence of Russia with its strongest army, let alone being a compatriot.