The EU and United States under then president Barack Obama imposed sanctions on Moscow over its 2014 annexation of Crimea and fighting in eastern Ukraine between government forces and pro-Russia rebels.
But it is as yet unclear whether Obama's successor Donald Trump, who is under fire domestically over allegations that Russia meddled to aid his election campaign last year, will maintain these sanctions.
"Since our last G7 summit in Japan, we haven't seen anything that would justify a change in our sanctions policy towards Russia," Tusk, who coordinates policy for the EU's 28 leaders, told reporters in Sicily.
Tusk already met with Trump yesterday in Brussels, and said that while both sides did not have a "common position about Russia", they appeared to be on the same line with regards to the Ukrainian conflict.
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In March, the US State Department said Washington's "Crimea-related sanctions will remain in place until Russia returns control of the peninsula to Ukraine".
"Right now, we don't have a position," he told reporters on board Air Force One as Trump headed to Sicily, his final stop on his first foreign trip.
"He's got many options," Kohn added, without giving further details.