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Foreign Secretary William Hague says he believes Russia's intervention in Ukraine will "turn out, over time, to be quite a big miscalculation."
Speaking on The Andrew Marr Show, he added he wanted to see diplomatic progress in Ukraine with tensions reduced.
Vitali Klitschko says war with Russia would be a "disastrous scenario", warning a press conference in Donetsk that Ukraine's army is not in a "good state".
ITV News' Emma Murphy reports:
Klitschko - For many years Gov tried to run down the Ukrainian army. They are not in good state. They do not have the equipment>
Klitschko: We didn't expect this from Russia but we cannot solve it with the weapon. Bloody war is a disastrous scenario.
Klitschko says he worries that Russian troops will advance but asked how they can stop it/what they would do has no answer, stares at table.
Search teams are continuing their efforts to find a Malaysian airliner that disappeared while en route to Beijing on Saturday.
Two passengers, who travelled on the aircraft, are being investigated by authorities.
Ukrainian potential presidential hopeful Vitali Klitschko has distanced himself from the current government in Kiev, while calling for national unity. ITV News' Emma Murphy reports from his press conference in Donetsk:
Klitschko "No matter what language you speak, what religion you r, which region you live in. Only one question. Do you love Ukraine or not?"
Klitschko distances himself frm current Government and accepts there are some from the old regime within. Vows to work to destroy corruption
Klitschko touring country seeking unity.Simple msg, if u live in Ukraine and love Ukraine help us. Little love in Donetsk from some.
ITV News' Emma Murphy reports from a press conference given by Ukrainian potential presidential hopeful Vitali Klitschko in Donetsk:
Klitschko says he has a word for those who call for the East to be separate from Ukraine, "Tourists, tourists from Russia."
Klitschko: "We are ready to defend Ukraine from invasion but our first task is to avoid military aggression from both sides."
A suicide bomber driving a minibus packed with explosives killed at least 32 people and wounded 147 on Sunday in the southern Iraqi city of Hilla, police and medical sources have told the Reuters news agency.
The attacker approached a main checkpoint at a northern entrance to the largely Shi'ite Muslim city and detonated the minibus, a police officer said.
At least 50 cars were set ablaze with passengers trapped inside and part of the checkpoint complex was destroyed, the officer added.
Russian forces have taken control of a Ukrainian border guard post in western Crimea, trapping about 30 personnel inside, according to a border guard spokesman.
He said the Chernomorskoye base on the western edge of the Black Sea peninsula had been taken over without bloodshed at around 6am (4am GMT).
The spokesman, Oleh Slobodyan, said Russian forces now controlled 11 border guard posts in Crimea.
Russian forces' seizure of the southern Ukrainian region, which began 11 days ago, has been bloodless. Ukrainian troops are trapped in a number of bases but have offered no armed resistance.
Azharuddin Abdul Rahman, the head of the Malaysian department of civil aviation, has told reporters that two passengers travelling on the missing Boeing 777 were being investigated.
He added that authorities were checking CCTV footage of the two as they boarded the aircraft.
A 16-year-old boy is said to be in a serious condition in intensive care after taking what may have been a 'Mortal Kombat' ecstasy pill, police said.
Tests are also being carried out on a 17-year-old boy after both teens became ill following a house party in Coatbridge, North Lanarkshire, yesterday.
The pair were taken Monklands District General Hospital in Airdrie at about 11.30pm having apparently taken illegal drugs.
Police Scotland say they believe the drugs included ecstasy and "possibly" a Mortal Kombat tablet.
A NHS Lanarkshire spokeswoman said: "Anyone who has taken ecstasy - particularly the one described as 'Mortal Kombat', and who is feeling unwell, or who knows someone who has taken this type of drug in the past few hours, should attend or contact their local hospital for treatment and advice."