"The US philosophy of a global strike is obviously foolish because it aims at dealing irreparable damage within such a huge time span, " Yuri Solomonov, chief designer at the Moscow Institute of Thermal Technology (MIIT), told RIA Novosti.
Solomonov, who designed Russia’s submarine-launched Bulava ballistic missile and Topol-M ballistic missile, said some defense systems could target a missile in flight within five to 10 minutes after its launch.
"This would mean war, a system like this must not be used," he added, saying the US government was pouring funds into the PGS program.
The US military has reportedly been testing a PGS prototype for several years. Russia views PGS attack weapons as capable of delivering a disarming strike to its strategic infrastructure.