President Donald Trump on Thursday canceled his planned meeting with Russian Federation President Vladimir Putin at the G20 summit in Argentina.

“Based on the fact that the ships and sailors have not been returned to Ukraine from Russia, I have decided it would be best for all parties concerned to cancel my previously scheduled meeting in Argentina with President Vladimir Putin,” Trump tweeted. “I look forward to a meaningful Summit again as soon as this situation is resolved!”

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“The Kremlin regrets U.S. President Donald Trump’s decision to cancel a meeting with Russian President Vladimir Putin in Argentina and said Moscow is ready for contact with Trump, RIA news agency cited spokesman Dmitry Peskov as saying on Friday,” Reuters reported.

“This means that discussion of important issues on the international and bilateral agenda will be postponed indefinitely,” President Putin’s spokesman Dmitry Peskov said.

(Correction: A previous version of this story incorrect stated that Russia “rejected” Donald Trump’s plan to cancel the meeting. Raw Story regrets the error.)