In the past Putin has completely disagreed with you.
"Crimea is not a disputed territory...Russia has long recognized the borders of modern-day Ukraine." - Putin, 2008.
In an interview with Germany's ARD television in 2008, Russian President Vladimir Putin stated that Moscow recognizes all of Ukraine's borders, and that there is no issue of ethnic conflict in Crimea. His comments stand in stark contrast with Moscow's annexation of Crimea in 2014.
www.rferl.org
But hey, he woke up one day and changed his mind. Yesterday it's definetly Ukraine's, today it's definetly Russian.
Again, this is what dealing with Russia is like. There is no serious consistency or agreement they will not violate if it suits them.