To start, checks and balances in between the branches is the process of all three branches checking one another so that the branches remain balanced and not corrupt.
Examples of checks and balances in the government might be if the legislative branch were to make a law, this law would first have to go to the executive branch to have the president approve. If the president finds this law unconstitutional or corrupting, he/she has the right to veto or reject this law.
Another example would be when the Judicial branch checks a law made and accepted by the legislative branch. The Judicial branch will decide whether this new law is constitutional.
Soviet invasion of Afghanistan, invasion of Afghanistan in late December 1979 by troops from the Soviet Union. The Soviet Union intervened in support of the Afghan communist government in its conflict with anti-communist Muslim guerrillas during the Afghan War (1978–92) and remained in Afghanistan until mid-February 1989