Kyiv has called on other countries to follow and impose harsher economic sanctions on Moscow.
"Today we officially announced a complete termination of trade in goods with the aggressor state," Economy Minister Yulia Svyrydenko wrote on her Facebook page on Saturday.
"From now on, no Russian Federation's products will be able to be imported into the territory of our state."
Since the start of Russia's invasion of Ukraine on February 24, exchange of goods and services between the two neighbours has been virtually non-existent, but Saturday's move makes the termination of imports a law.
"The enemy's budget will not receive these funds, which will reduce its potential to finance the war," Svyrydenko said.
"Such a step of Ukraine can serve as an example for our Western partners and stimulate them to strengthen sanctions against Russia, including the implementation of the energy embargo and isolation of all Russian banks."
Ukraine's President Volodymyr Zelenskiy has repeatedly called on the West to boycott Russian oil and other exports and halt exports to Russia over its military assault.
The West has imposed numerous measures on Russia that have already isolated Moscow to a degree never before experienced by such a large economy and on Saturday British Prime Premier Boris Johnson said more sanctions are to come.
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