Under Putin's direct order Russia has been and IS AT WAR WITH UKRAINE.
Russia has stolen Crimea and turned it into a giant Russian, gulag hell hole replete with kidnappings, rape, murder, terrorizing the non-Russian population, massive theft of businesses and choice private properties throughout Crimea via = Russians and Russian Mafia showing up with phony property deeds stating they "own" the property and they are being given those properties by the new "Russian judges", Russian "courts", Russian "legal" "(in)justice" departments. These "judgments" handed down giving these Russian usurpers the properties are being enforced by new "Russian policemen" i.e. Russian THUGS or "little green men" in police uniforms.
Crimea receives the overwhelming majority of all of its water and electricity from Ukraine. Since Russia is at war with Ukraine, has stolen Crimea and is presently occupying Crimea; Ukraine is under no obligation to continue supporting the theft and subjugation of its own people and territory.
They also got a lot of their food from Ukraine and is having a hard time finding new supplies with the sanctions.