Yes of course… Russia acknowledged Ukraine’s borders and territorial integrity when:

• Ukraine was admitted to the UN in 1945 with its current borders (which Russia could have vetoed).

• Ukraine’s sovereign status and territorial integrity were guaranteed in the Belovezha Accords in 1991, which recognized the dissolution of the USSR and the borders and sovereignty of the former member states.

• Ukraine agreed to transfer control of its 4,700 nuclear weapons to the Russian Federation in exchange for guarantees by the US, UK, and Russian Federation that they would not threaten to use (or use) military force against Ukraine… in the Budapest Memorandum in 1996.

• Russia specifically recognized Ukraine’s sovereignty in Crimea when Ukraine agreed to lease it military bases there (and split the Black Sea fleet, stationed in Crimea, 50/50 in 1997) in the Partition Treaty.

• The two countries agreed not to declare war on one another, to treat each other’s territory as inviolable and to prohibit the use of military force to resolve any future territorial disputes in the same year’s Treaty of Friendship.

• Russia agreed to “final borders” in January 2003 (which include Crimea, Kherson, etc)

• As you know, Russia invaded Ukraine in 2014; they signed a ceasefire in 2015 once again confirming Ukraine’s territorial integrity, but this was almost immediately violated, so I’m not sure I’d even count it.

Hope it helps. The three that were top of mind for me were 1991, 1996, and 2003.

One of them is the Budapest Memorandum

Not sure which are the other to. Perhaps https://en.m.wikipedia.org/wiki/Lisbon_Protocol

It’s always fascinating to hear Putin talk about “history”, and “denazification”. You know the truth, so you can observe a mad man lying, and perhaps believing it. Like a child telling an obvious lie, convinced he pulled it off. Except, much less cute and a lot more terrifying.