NATO's European commander says top officials from both countries may discuss issue at alliance meeting next week

After Putin talks, Turkish president gives indication of timeframe for missile defense system's arrival, which may lead to Washington kicking Ankara out of F-35 fighter jet program

Washington says it may kick Ankara out of F-35 fighter jet program for deal with Russians; Turkish foreign minister: Country won't bow to 'ultimatums'

Officials warn training of pilots currently in America could also be halted over growing rift between Washington and Ankara

Ankara pushing ahead with purchase of missile defense system, despite mounting pressure from US and other NATO allies

Ankara’s purchase of weapons system risks US sanctions and has strained already tense relations with Washington