European Union foreign ministers have two tough issues on the agenda of their meeting in Brussels on Monday.
They will discuss the prospect of Hamas forming the next Palestinian government and whether future EU funding should depend on Hamas renouncing violence.
In addition, they will also have to decide whether Serbia and Montenegro deserve punishment for failing to hand over wanted war criminal Gen Mladic.
Ministers will consider whether to delay talks on closer ties with Serbia.
'Clear warning'
The EU has already warned Serbia that moves towards eventual EU membership could be halted if Belgrade fails to hand over Ratko Mladic.
The former Bosnian Serb wartime general, who has been a fugitive since 1995, has been charged with genocide and other crimes related to the Bosnian war.
Rumours that he was on the point of being arrested last week proved a false alarm.
The BBC's Tim Franks in Brussels said EU politician's patience seems to be running out over Serbia and will threaten a freeze on talks due to resume in five weeks time on setting up closer relations.
"There's likely to be a clear warning today that that won't happen as long as the Serbian government is deemed not to be doing enough to hand war crimes suspects over for trial," he said.
A year ago, the EU postponed entry talks with Serbia's neighbour, Croatia, for its failure to hand over a war crimes suspect, says the BBC's Matt Prodger in Belgrade.
It subsequently delivered. But Serbia and Montenegro is at a much earlier stage of the entry process and some countries fear that punishing it too early may amount to double standards.
Money running out
On the issue of the militant group Hamas, the EU foreign ministers appear to be giving more time for consideration.
With the Palestinian authority running out of money, senior EU diplomats say it is not in anyone's interest to see the authority collapse.
The foreign ministers are expected to approve temporary release of extra funding, but to postpone a decision on what will happen if, as expected, Hamas form a new Palestinian government.
The question remains how far should any direct funding hang on Hamas renouncing violence and recognising Israel, our correspondent says.
(BBC)
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