Lavrov hints that it was the US, not Russia that wasn't ready for negotiations in Budapest:

"We are also prepared to discuss with our American colleagues the resumption of preparatory work for the summit between the leaders of Russia and the United States that they had proposed.

If and when our American colleagues renew their proposal and are ready to begin preparations for a high-level meeting so that it can truly produce meaningful results, Budapest would, of course, be our preferred location - all the more so since Donald Trump, during his meeting with Viktor Orbán, confirmed that Budapest is also Washington’s preferred venue."
https://x.com/Gerashchenko_en/status/1988243226520662017?s=20

https://files.catbox.moe/qy7ua0.mp4