Ukraine's opposition is to push for a vote in
parliament on changes to the constitution - a move aimed at curbing President
Viktor Yanukovych's powers.
The
opposition has repeatedly warned that failure to act will further inflame mass
anti-government protests, reported BBC.
A protest rally is also expected
outside the parliament building in the capital Kiev.
Pro-presidential MPs - who have a
majority - have opposed attempts to return to the 2004 constitution.
In a separate development, Russian
Finance Minister Anton Siluanov said Moscow would provide Ukraine with a new
$2bn (£1.2bn) tranche of aid "this week".
In December, Moscow pledged $15bn to
back Ukraine's struggling economy, but so far only $3bn has been transferred.
The Kremlin had hinted it would freeze
the aid until a new government acceptable to Moscow was formed after Ukraine's
PM Mykola Azarov resigned last month.
