KHARTOUM (Reuters) - The United States and Europe on Sunday stepped up warnings of sanctions unless Sudan halts a conflict in its Darfur region, and Australia said it was likely to contribute troops to any U.N. peacekeeping mission.

Sudanese President Omar Hassan al-Bashir told reporters in Khartoum his government was ready to cooperate with the African Union and the international community, but gave no details.

"The Sudanese people and their government are capable of reaching a solution to the problem in Darfur through constructive dialogue," Bashir said in his latest comments on what the U.N. calls the world's worst humanitarian crisis.

Germany said Foreign Minister Joschka Fischer and Secretary of State Colin Powell agreed in telephone talks that "sanctions will be unavoidable if the (Khartoum) government does not meet its self-set commitments in Darfur."

Many countries have demanded Khartoum disarm Arab militias accused of mounting a scorched earth policy against black Africans in the arid western region that the U.S. Congress has branded genocide. The U.N. says 30,000 people have been killed.

Germany and other European nations that opposed the U.S.-led war on Iraq have found common cause with Washington over Darfur as television images show camps of destitute refugees -- among the 1.5 million the U.N. says have been displaced by fighting.

CHINA, RUSSIA OPPOSE SANCTIONS

A U.S.-drafted resolution seeking to threaten oil-producing Sudan with sanctions remains stalled in the United Nations Security Council by China and Russia -- two of the five veto-wielding permanent members.

Sudan, Africa's largest country, has said it is improving security and aid distribution in Darfur.

The Netherlands, which holds the European Union's rotating presidency, said sanctions were not needed yet but the world would eventually impose them if Khartoum did not act.

"If the situation does not visibly improve, then sanctions will almost surely be brought by the international community," Dutch Foreign Minister Bernard Bot said after talks with visiting Sudanese Foreign Minister Mustafa Osman Ismail.

French Foreign Minister Michel Barnier begins a three-day trip to Africa on Monday with a visit to Darfur.

Australian Foreign Minister Alexander Downer said Australia was likely to contribute a small number of troops to any U.N. peacekeeping mission.

"There's a good chance that we will send some troops to Sudan," Downer told Nine Network television.

Britain has not ruled out military intervention.

MOSQUE LEAFLETS URGE ATTACKS

A statement distributed at a central Khartoum mosque called for attacks on any U.S. or British troops sent to Darfur.

"We call upon you to speedily head toward Darfur and dig deep into the ground mass graves prepared for the crusader army," said the statement, purportedly from a previously unknown group calling itself Mohammed's Army.

Many observers said rebels in Darfur were obstructing peace efforts in the expectation that the plight of large numbers of refugees would force the international community to intervene.

Attempts to reach a political solution in Darfur stumbled last week when the two main rebel groups refused to take part in talks after the government turned down six preconditions.

A key rebel demand is the disarmament of the Arab militias, known as Janjaweed.

The rebels say the government armed the militias, a charge Khartoum denies, and both sides trade accusations of violating a cease-fire agreed in April.

"It is obvious that the rebels feel that if they agitate enough they can force the hand of the international community and bring about an intervention on the ground," said a Western observer in Khartoum who declined to be named.

PEACE TALKS IN DOUBT

The rebel Sudan Liberation Movement has not said whether it would be going to talks in Addis Ababa with the government as the U.N. announced on Friday.

The leader of the other main rebel group, the Justice and Equality Movement, said on Saturday there would be no talks with the government until the Janjaweed were disarmed.

Jailed Sudanese Islamist leader Hassan al-Turabi, 72, accused of inciting rebels in Darfur, was taken to hospital after eating nothing but dates to protest against his detention, said his daughter Omama.