Question: When was an agreement signed for China's help?
About the article "Pakistan", section "Nuclear power".

Candidate passages:
China's education authorities have re-established Jinggangshan University in the area known as the cradle of Chinese revolution 44 years after it was closed.
The Ministry of Education and the provincial government of Jiangxi have signed an agreement to provide more support for Jinggangshan University. 
After Stalin died on March 5, 1953, Zhou left for Moscow and attended Stalin's funeral four days later.
Mao, curiously, decided not to travel to Moscow, possibly because no senior Soviet politician had yet travelled to Beijing, or because Stalin had rejected an offer to meet with Mao in 1948 (nevertheless, a huge memorial service in honor of Stalin was held in Beijing's Tiananmen Square with Mao and hundreds of thousands more in attendance).
While in Moscow, Zhou was notably received with considerable respect by Soviet officials, being permitted to stand with the USSR's new leaders (Nikita Khrushchev, Georgi Malenkov, and Lavrentiy Beria), instead of with the other "foreign" dignitaries who attended.
With these three leaders, Zhou walked directly behind the gun carriage bearing Stalin's coffin.
Zhou's diplomatic efforts on his travel to Moscow were rewarded shortly after when, in 1954, Khrushchev himself visited Beijing to take part in the fifth anniversary of the founding of the People's Republic.
Throughout the 1950s, Zhou worked to tighten economic and political relations between China and other Communist states, coordinating China's foreign policy with Soviet policies promoting solidarity among political allies.
In 1952, Zhou signed an economic and cultural agreement with the Mongolian People's Republic, giving "de facto" recognition of the independence of what had been known as "Outer Mongolia" in Qing times.
Zhou also worked to conclude an agreement with Kim Il-sung in order to help the postwar reconstruction of North Korea's economy.
Pursuing the goals of peaceful diplomacy with China's neighbors, Zhou held amicable talks with Burma's prime minister, U Nu, and promoted China's efforts to send supplies to Ho Chi Minh's Vietnamese rebels known as the Vietminh. 
Official relations between the Somali and Chinese governments were established on 14 December 1960.
Somalia and China later signed their first official trade agreement in June 1963.
During the Cold War period, the Somali government maintained active relations with its Chinese counterpart.
The Somali authorities campaigned for an end to China's diplomatic isolation and supported instead its entry into the United Nations.
The Sino-Soviet split had a large influence on China's relations with countries in Africa.
As early as 1964, Somalia was described as the first major center of Sino-Soviet rivalry on the continent.
When the Somali side expelled Soviet representatives in late 1977, China agreed to take over many of the development projects started by them. 
In World War II, Hungary sent 12.000 soldiers to Denmark, through Germany.
After the Hungarian Revolution of 1956, 1,400 Hungarians fled to Denmark.
137 million DKK were collected to help the Hungarians.
In 1948, a payments agreement was signed between both countries.
On 20 October 1969, Denmark and Hungary signed an agreement on economic, industrial, and technical cooperation.
An agreement on compensation for Danish interests in Hungary was signed on 18 June 1965. 
While Vietnam has remained relatively conflict-free since its Cambodia days, tensions have arisen in the past between Vietnam and its neighbors, especially in the case of China since both nations assert claims to the Spratly Islands, an archipelago in a potentially oil-rich area of the South China Sea.
Conflicting claims have produced over the years small scale armed altercations in the area.
In 1988, more than 70 Vietnamese troops were killed during a confrontation with Chinese forces, when China occupied several islands under Vietnamese control in the Spratly Islands.
China's assertion of control over the Spratly Islands and the entire South China Sea has elicited concern from Vietnam and its Southeast Asia neighbors.
The territorial border between the two countries is being definitively mapped pursuant to a Land Border Agreement signed in December 1999, and an Agreement on Borders in the Gulf of Tonkin signed in December 2000.
Vietnam and Russia declared a strategic partnership in March 2001 during the first visit ever to Hanoi of a Russian head of state, largely as an attempt to counterbalance China's growing profile in Southeast Asia.
Disputes - international: maritime boundary with Cambodia not defined; involved in a complex dispute over the Spratly Islands with the People's Republic of China (PRC), Republic of China (ROC), Malaysia, Philippines, and possibly Brunei; maritime boundary with Thailand resolved in August 1997; maritime boundary dispute with the PRC in the Gulf of Tonkin resolved in 2000; Paracel Islands occupied by the PRC but claimed by Vietnam and the ROC; offshore islands and sections of boundary with Cambodia are in dispute; agreement on land border with the People's Republic of China was signed in December 1999.
Illicit drugs: minor producer of opium poppy with 21 km2 cultivated in 1999, capable of producing 11 metric tons of opium; probably minor transit point for Southeast Asian heroin destined for the US and Europe; growing opium/heroin addiction; possible small-scale heroin production