Only if they used them within 60 days of getting them.
The high-tech maintenance issues for nukes is non-trivial, and runs contrary to most urban myths about them.
Also, keep in mind that nukes leave a unique radiation signature much like DNA. We'll know who built the nuke, where the uranium was enriched (or plutonium bred) shortly after any surface or aerial detonation anywhere (sub-surface can take up to 90 days depending on depth and rock formations above the blast)...something that Russia, China, Pakistan, or France would not appreciate some 15 minutes later (ICBM travel time from the U.S. and from our Boomers at sea).