The Soviet Union was asked by the Democratic Republic of Afghanistan to intervene to fight against the insurgents that the US was arming (the same as in Syria).

Articles:

Leslie Feinberg: U.S. and Afghanistan: The cynical abuse of ‘women’s rights’

Michael Parenti: Afghanistan, Another Untold Story

William Blum: Afghanistan, 1979-1992: America’s Jihad (archived)

William Blum: The Historical US Support for al-Qaeda (archived)

Zbigniew Brzezinski & the lies about Afghanistan (archived)

3 popular myths about the Soviets in Afghanistan (archived)

RT: A war that shouldn’t have happened: How the USSR made its worst-ever mistake (archived)

Government documents:

‘Invasion’ of Afghanistan

Pravda Editorial, Soviet troops in Afghanistan? Pure fabrication. December 23, 1979

DIRECTIVE Nº 312/12/001 OF 24 DECEMBER 1979 SIGNED BY USTINOV AND OGARKOV

Report on Events in Afghanistan on 27-28 December 1979. December 31, 1979

Appeal by the government of Afghanistan. December 29, 1979

TASS, On Events in Afghanistan. December 30, 1979

U.S. Foreign Policy in the Carter Years, 1977-1981

More:

NSA archive: Brzezinski Interview

Excerpt from ‘Killing Hope’

We created Islamic extremism: Those blaming Islam for ISIS would have supported Osama bin Laden in the ’80s

The Shah, Not Kremlin, Touched Off Afghan Coup

The Taliban indoctrinates kids with jihadist textbooks paid for by the U.S.:

THE ABC’S OF JIHAD IN AFGHANISTAN * Courtesy, USA (archived)

A collection of images of the liberation struggle of the Democratic Republic of Afghanistan and the Red Armed Forces (original)

Space Shuttle Flight Dedicated to the Afghan mujahideen:

Ukraine:

The Grayzone: A new generation of US-trained extremists is fighting Russia. Are we prepared for the blowback? (archived)

RT: America’s Neo-Nazi bedfellows in Ukraine are latest in long line of odious allies Washington has used against Russia (archived)

Related:

Western Intervention in the U.S.S.R.

Lies about the Holodomor, Joseph Stalin, & the U.S.S.R.