The UN General Assembly has adopted a Western-backed resolution declaring Crimea's breakaway referendum illegitimate and refusing to recognise Russia's annexation of the peninsula.
The non-binding resolution passed with a comfortable majority in the 193-member body, with 100 votes in favour and 11 votes against.
Ukraine, which drafted the resolution, had urged the international community to back the text, hoping an overwhelming show of support would ward off further Russian moves against it.
"I am convinced that a strong vote today will help to deter further aggressive moves," acting Ukrainian Foreign Minister Andriy Deshchytsya told the assembly.
"It sends an essential message that the international community will not allow what has happened in Crimea to set a precedent to further challenges to our rules based in framework," he added.
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Western diplomats wanted a strong majority vote to press home what they say is Russia's isolation, but there had been fears that a high number of countries would abstain.
The resolution garnered more support than a similar text passed in 2009 over the Georgia crisis, which was adopted by 48 votes.
Seventy-eight countries abstained and 19 voted against.
Ukraine submitted the draft resolution, writing the text in moderate language in the hope of attracting a maximum number of votes, and it makes no direct reference to Russia.
The text is similar to a US-drafted resolution submitted to the Security Council on March 19, which Russia vetoed.
China abstained and the other 13 members of the council voted in favour.
Thursday's resolution repeats that the March 16 referendum in Crimea has "no validity" and asks countries not to recognise any alteration of the status of the Black Sea peninsula.
It calls on all states to refrain from any attempts to modify Ukraine's borders through the threat or use of force or other unlawful means and calls for dialogue to resolve the crisis.
Ukraine said that a vote for the resolution was a vote for the UN charter, while a vote against or an abstention equalled undermining it.
"One month has cost us dearly. More inaction may cost us this organisation," he added.
The United States backed Ukraine's request and criticised Russia.
US ambassador Samantha Power told the assembly it was "disheartening in the extreme to see Russia carry on as if Ukrainians have no legitimate interest in Crimea".
Russia stuck to its guns, saying it had no right to refuse support to Crimeans in their right to self-determination.
