"I am not happy with the Russian strikes on KYIV. Not necessary, and very bad timing," Trump wrote in a social media post.
The Kremlin chief signed the agreement with Iranian President Masoud Pezeshkian in January.
Russian President Vladimir Putin declared a unilateral Easter ceasefire in Ukraine, ordering his forces to end hostilities on Saturday until the end of Sunday.
A Ukrainian official said on Saturday that Russian forces were continuing to open fire on Ukrainian positions despite Putin's proclamation of an Easter ceasefire.
This comes after Donald Trump told reporters that he would walk away from negotiations if he thought either party was hindering the agreement.
Crimea was taken over by Russia in early 2014. Russian President Vladimir Putin has sought international recognition of Crimea as part of Russia's territory.
Rubio also stated that the United States will stop trying to broker a Russia-Ukraine peace deal within days unless there are clear signs that a deal can be done.
EUROPE AFFAIRS | "Russia only understands the language of force,” Maj.-Gen. Vadym Skibitsky told the 'Post.'
The Jewish community of Sumy, in northeastern Ukraine, was forced to observe Passover under the sound of sirens and the threat of deadly missile attacks.
This came after Volodymyr Zelensky announced that 34 peopled died in the Russian attack.
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