On April 1, the 1997 Ukraine-Russia Friendship Treaty lost its effect and is now considered invalid. The respective law, which stipulated its termination, took effect in December 2018.
The Treaty on Friendship, Cooperation, and Partnership between Ukraine and the Russian Federation was signed on May 31, 1997, by President of Ukraine Leonid Kuchma and President of Russia Boris Yeltsyn. The Verkhovna Rada, Ukraine's Parliament ratified the treaty on January 14, 1998, and the State Duma on December 25, 1998. The document came into force on April 1, 1999. Under this particular document, the sides were obliged to respect each other's territorial integrity and confirmed the inviolability of the state borders, which were present at the time of the document's signature.
Ukraine-Russia Friendship Treaty document has been discarded due to the ongoing Russian aggression in Ukraine.
Last month, Russia protested against the termination of the Treaty. Russian Foreign Ministry blamed the Ukrainian side for 'failing to live up to the document'.