Why a US Security Guarantee for Ukraine Risks Becoming a Paper Tiger

No party will control the 67 Senate seats required to ratify a formal treaty, yet the arithmetic is misleading. While Washington could likely scrape together a supermajority for a security guarantee, a congressional vote alone cannot solve the fundamental problem: creating a commitment that survives a change in presidential administration.

Editorial·November 1, 2026·reads: 1,072

The upcoming talks in Abu Dhabi are expected to center on a US security guarantee for Ukraine. Volodymyr Zelensky has explicitly demanded a commitment that carries more weight than the failed 1994 Budapest Memorandum. However, the legal form of this promise—whether it is a formal treaty, a congressional-executive agreement, or a simple executive order—remains fluid. While a treaty requires a two-thirds Senate majority, history shows that even ratified agreements can be unilaterally dismantled by a president, as seen with the Anti-Ballistic Missile Treaty or the Open Skies Treaty.

Ultimately, the value of any guarantee rests on whether it includes a 'withdrawal lock' similar to the 2024 defense authorization act for NATO, and whether it is backed by a physical presence on the ground. Without such safeguards, a formal Senate vote may provide only the illusion of permanence. If the agreement relies on discretionary language—such as acting to meet a danger 'in accordance with constitutional processes'—it risks mirroring Russia’s 2020 guarantee to Karabakh, which collapsed the moment Moscow’s priorities shifted. For Kyiv, the true test of the Abu Dhabi negotiations will not be the Senate seal, but the specific clauses that prevent a future president from walking away.