2x8 - The New Avengers

In 1965, a young Russian soldier guns down a Salvation Army Band and escapes only to fall down dead and grow old. In France, in 1977, a young Russian soldier attacks men wearing uniforms. Then a Russian unit is attacking an empty home. After one of the soldiers dies, he also ages. Why are the Russians attacking old targets and then aging? Steed and company are trying to find answers.