Modern russian tanks are known for their size and sheer firepower. With size and firepower equates to bulk and weight. Newer ones like the T80 and T90 are armored so that adds up to its weight. Typical Russian MBT's would weigh somewhere between 45-70 tons! Nowhere in the Philippines could a bridge withstand that! If you were to go for light tanks here are some that you may consider:
PT-76
The PT-76 was developed in 1949-1951 under the leadership of Z.Y. Kotin, and officially adopted on 16 August 1952. The production started in 1953 at the Volgograd Tractor Factory. In 1958 an improved variant, PT-76B, was adopted and remained in production until 1963.
About 7,000 PT-76s were built during the vehicle's lifetime, of which about 2,000 were exported. Over 25 countries employed the vehicle, including Afghanistan, Albania, Angola, China, Congo, Cuba, Egypt, Finland, Guinea, India, Indonesia, Iraq, Laos, Madagascar, Mozambique, North Korea, Pakistan, Poland, Vietnam, and Yugoslavia.
The tank is still in active service in a number of countries. The Russian Army is reported to have used PT-76 units in the ongoing war in Chechnya, and the Indonesian Army used it on the Indonesian island of Ambon during civil unrest from 2000 onwards.
The People's Republic of China is still building Type 63 light tank, based on the PT-76, for its Army and Marine Units. The Type 63 has been exported to Pakistan, Sudan, Tanzania, Myanmar and Vietnam.
Crew 3
Length 6.91 m
Width 3.15 m
Height 2.26 m
Weight 14.0 tonnes
Armour and armament
Armour 14 mm
Main armament 76 mm gun
Secondary armament 7.62 mm machinegun
Mobility
Power plant V-6 diesel
240 hp (177 kW)
Suspension torsion-bar
Road speed 44 km/h
Power/weight 17 hp/tonne
Range 260 km
BMP-3 IFV
The BMP-3, introduced in 1990, is a development of the BMP-1 and BMP-2. It is armed with a 100mm main gun, which can fire conventional HE-Frag shells or AT-10 Stabber ATGMs, a 30mm autocannon, and a 7.62mm machine gun, all mounted coaxially in the turret. There are also two 7.62mm bow machine guns.
The BMP-3 is capable of engaging targets out to 4,000 meters, with its ATGM weapon system (with an approximately eighty percent probability of a hit at that range). For comparison, U.S. M1 Abrams main battle tank is capable of hitting a tank-sized target with a probability of fifty percent at 4,000 meters. Note however that missile based systems have a significant minimum range, within which only gunfire can engage targets, and that the flight time to maximum range is twelve seconds. If the missile launcher is destroyed, missile guidance ceases and the missile may well then miss its target. According to the manufacturer's web-site, all weapons can be fired from the halt, on the move and afloat with the same effectiveness. The ability to hit targets on the move with missiles was demonstrated during competitive evaluations in the UAE in 1991.
Weight 18.7 tonnes
Length 7.14 m
Width 3.2 m
Height 2.4 m
Crew 3 (+7 passengers)
--------------------------------------------------------------------------------
Armour 35mm max
Primary
armament 100mm gun/launcher 2A70, 30mm autocannon 2A72
Secondary
armament 3×7.62mm PKT machine guns
Engine diesel
500 hp (375 kW)
Power/weight 27 hp/tonne
Suspension torsion bar
Operational
range 600 km
Speed 70 km/h (road)
45 km/h (off-road)
But if you want something light and with firepower, just go for the US Stingray III. This tank is way better than the other 2 mentioned above...in my opinion. Look at the thread about upgrading the Scorpion under Philippine Army (i think) to learn more about it.