FACTBOX: How China and Taiwan square up militarily

BEIJING (Reuters) - U.S. military strategists will be watching China's military parade on October 1 to see if the country is developing an anti-ship ballistic missile, which could change U.S. strategy for defending Taiwan.

The military balance between China and Taiwan is already rapidly shifting in China's favor.

Despite improved political ties following the election in Taiwan of a more pro-Beijing president last year, China has yet to renounce the use of force to recover the self-ruled island it considers its sovereign territory.

Following is a brief comparison between China's and Taiwan's military forces:

ARMY / China / Taiwan

Personnel / 2.3 million* / 277,765

- China's 2.3 million-strong armed forces are far bigger than the world's second-largest military, that of the United States, whose forces number around 1.5 million. The People's Liberation Army (PLA) was born out of the Red Army, a 5 million-strong peasant army, which swept the Communists to power in 1949.

Soviet expertise helped organize it into a mass army geared toward wars of attrition during the 1950s, when it fought in the 1950-1953 Korean War alongside North Korea. The PLA is morphing into a modern force capable of fighting short, high-intensity conflicts against high-tech adversaries.

- With U.S. military aid, Taiwan transformed its army from the defeated remnants of the Nationalist forces that fled to the island in 1949 into a modern, disciplined military that is now downsizing in favor of improved technology.

Its primary role is protecting Taiwan and countering any sea or air assault from China. The army has been slimmed down in recent years as Taiwan tries to shift away from a conscript-heavy force to a more professional fighting unit.

AIR FORCE / China /Taiwan

Fighter aircraft / more than 2,000 / about 400

- China used to rely on somewhat substandard copies of Soviet-made aircraft, but these days has developed a more formidable design capacity. Its most advanced aircraft, and for Taiwan the potentially most threatening, are Russian Su-30 and Su-27 fighters.

- The backbone of Taiwan's air force is made up of U.S.-made F-16s, around 60 French-built Mirage 2000s and about 130 Ching-kuo Indigenous Defense Fighters, though the defense ministry will not give exact numbers.

Training is the air force's strong suit, but experts say that a well-planned early Chinese missile strike could take out most Taiwan airbase runways and render the island's aircraft, hidden in fortified or mountain bunkers, trapped on the ground.

NAVY ** /China / Taiwan

Destroyers /26 /9

Frigates / 47 /22

Submarines / 63 / 4

- Once limited to just protecting China's coast, the Chinese navy has developed in leaps and bounds. Last year, Chinese warships began conducting anti-piracy missions in the sea around Somalia. China has a large and expanding submarine fleet, and has been looking at building an aircraft carrier.

- Taiwan's navy includes four submarines, two of which date from World War Two, and a small fleet of destroyers and frigates. The Defense Ministry will not give exact figures.

MISSILES

- Aside from the estimated 1,000 to 1,500 missiles that China is thought to have aimed at Taiwan, the Chinese navy is equipped with powerful Russian "Sunburn" anti-ship missiles, a weapon much feared by U.S. military strategists.

U.S. strategists say it may also be developing anti-ship ballistic missiles to keep U.S. aircraft carriers at bay.

China also has nuclear weapons.

- Taiwan has older-model Patriots to intercept any missiles fired at the island and domestically-made Hsiung Feng surface-to-surface missiles. These could be aimed at ships or used to target nearby Chinese cities such as Shanghai.

Taiwan is believed to have abandoned a covert nuclear weapons programme in the 1980s under U.S. pressure.

Notes:

* Does not include about 1 million Chinese reserves and about 800,000 paramilitary People's Armed Police.

** Warship numbers mostly analyst estimates.

Sources: Reuters, International Institute for Strategic Studies, globalsecurity.org, Taiwan's Ministry of National Defense.

(By Ben Blanchard and Ralph Jennings; Editing by Alex Richardson)