How about the 1994 Budapest Memorandum, where Russia, the UK, and the US guaranteed Ukraine’s borders in return for Ukraine giving up its nuclear weapons. Russia has violated every commitment it pledged in the memorandum. The US and the UK pledged to support Ukraine in the event of Russian aggression against Ukraine.
Ukraine, the Russian Federation, the United Kingdom of Great Britain and Northern Ireland, and the United States of America,
Welcoming the Accession of Ukraine to the Treaty on the Non-Proliferation of Nuclear Weapons as a non-nuclear-weapon state,
Taking into account the commitment of Ukraine to eliminate all nuclear weapons from its territory within a specified period of time,
Noting the changes in the world-wide security situation, including the end of the Cold War, which have brought about conditions for deep reductions in nuclear forces,
Confirm the following:
1. The Russian Federation, the United Kingdom of Great Britain and Northern Ireland, and The United States of America reaffirm their commitment to Ukraine, in accordance with the principles of the CSCE Final Act, to respect the independence and sovereignty and the existing borders of Ukraine.
2. The Russian Federation, the United Kingdom of Great Britain and Northern Ireland, and The United States of America reaffirm their obligation to refrain from the threat or use of force against the territorial integrity or political independence of Ukraine, and that none of their weapons will ever be used against Ukraine except in self-defense or otherwise in accordance with the Charter of the United Nations.
3. The Russian Federation, the United Kingdom of Great Britain and Northern Ireland, and The United States of America reaffirm their commitment to Ukraine, in accordance with the Principles of the CSCE Final Act, to refrain from economic coercion designed to subordinate to their own interest the exercise by Ukraine of the rights inherent in its sovereignty and thus to secure advantages of any kind.
4. The Russian Federation, the United Kingdom of Great Britain and Northern Ireland, and The United States of America reaffirm their commitment to seek immediate United Nations Security Council action to provide assistance to Ukraine, as a non-nuclear-weapon state party to the Treaty on the Non-Proliferation of Nuclear Weapons, if Ukraine should become a victim of an act of aggression or an object of a threat of aggression in which nuclear weapons are used.
5. The Russian Federation, the United Kingdom of Great Britain and Northern Ireland, and The United States of America reaffirm, in the case of Ukraine, their commitment not to use nuclear weapons against any non-nuclear-weapon state party to the Treaty on the Non-Proliferation of Nuclear Weapons, except in the case of an attack on themselves, their territories or dependent territories, their armed forces, or their allies, by such a state in association or alliance with a nuclear weapon state.
6. Ukraine, The Russian Federation, the United Kingdom of Great Britain and Northern Ireland, and The United States of America will consult in the event a situation arises which raises a question concerning these commitments.
This Memorandum will become applicable upon signature.
Signed in four copies having equal validity in the Ukrainian, English, and Russian languages.
FOR UKRAINE:
(signature Leonid Kuchma)
FOR THE RUSSIAN FEDERATION:
(signature Boris Yeltsin)
FOR THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND:
(signature John Major)
FOR THE UNITED STATES OF AMERICA:
(signature Bill Clinton)
Budapest, 5 December 1994.
It is interesting that the US interests involved Donald Blinken, Anthony Blinken's father. So from Clinton to Biden, there is some interesting Democrat Party continuity. Odd, also that these were not treaties in the formal sense, nor "agreements" as you state, but "assurances" in the clever distinctions of politics, world and national.
I appreciate you're looking into the various documents, which are worth considering.
I'd venture to say that the Budapest memoranda, plural, are no longer in force, given that they are eighteen years old and now and violated a number of times by Russia, as well as the 2013 complaint from Belarus that the US violated it. Kravcjhuk also signed the Lisbon Protocol which is a footnote to the story. Look into the vocabulary, as it was all watered down into "assurance," and the non-treaty, as with so many, was never ratified by the US Congress as required by our laws. Ditto with so many, like the Paris Accords. As contrast the new START Treaty remains in force.
Minutiae aside, the current conflict is not one of treaties broken, nor one of NATO members interlocking defense agreements, but something quite its own non-NATO event. What is certain is that the princelings of Biden, Pelosi, Kerry and Romney were using post-Maidan, pre-SMO Ukraine as a very fine cash cow. Interests aplenty, with a suspicion that other political names in the cash cow now losing its function because Vlad the Warmonger is warring against Volodymyr the warmonger, and many backdoors seem closed. Given that Vindman the American Ukrainian was so prominent in the impeachment process against Trump, there are many sides to this complex issue.
So "not my circus and not my clowns" as regards the seeming two sides, Ukraine and Russia, my circus and my clowns are the current Biden regime and the many-headed hydra of the corrupt state in America. For this, the other circus is a side show.