The new leader of the TUC has pledged to "reach out, campaign and fight back more" as workers and families struggle under the Government's austerity measures.
Frances O'Grady, who succeeds Brendan Barber as general secretary at the end of the year, said she will make sure governments and political parties do not take unions for granted.
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163,000 French and 143,000 German soldiers were killed in the 10-month battle in 1916.
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The fire broke out on Sunday morning at the home for 35 residents in Litochki, a village 25 miles north of Kiev.