He told reporters in Luxembourg "it will come as no surprise to the Russian Federation" that the Dutch have now asked for the tribunal to order the release pending a final decision in the case.
Timmermans said it would likely take about a month for the tribunal to reach a decision on the request.
In a statement, Greenpeace International welcomed the Dutch initiative and called on other governments whose nationals are among the detained activists "to step up their work to ensure the immediate release of the detainees."
The tribunal the Dutch are turning to adjudicates in disputes arising from interpretation and application of the 1982 United Nations Convention on the Law of the Sea.
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Associated Press writer Raf Casert contributed to this story from Luxembourg.